Curated Shelf

Biology

Darwin's Origin, Huxley — popular-level Victorian/Edwardian science writing.

1556 WorksDrawn from Project Gutenberg Bookshelf #669

Life and Letters of Charles Darwin — Volume 1
Darwin, Charles
41,879 Gutenberg downloadsen2000Difficulty 54 (Graduate)
More Letters of Charles Darwin — Volume 1 A Record of His Work in a Series of Hitherto Unpublished Letters
Darwin, Charles
41,247 Gutenberg downloadsen2001Difficulty 50 (College)
The Notebooks of Leonardo Da Vinci — Complete
Leonardo, da Vinci
33,964 Gutenberg downloadsen2004Difficulty 52 (Graduate)
Letters of Asa Gray; Vol. 2
Gray, Asa
29,207 Gutenberg downloadsen2017Difficulty 47 (College)
The Natural History of Pliny, Volume 3 (of 6)
Pliny, the Elder
28,750 Gutenberg downloadsen2019Difficulty 38 (High School)
On the Origin of Species By Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life
Darwin, Charles
17,073 Gutenberg downloadsen1998Difficulty 61 (Academic)
Studies of American Fungi. Mushrooms, Edible, Poisonous, etc.
Atkinson, George Francis
10,274 Gutenberg downloadsen2008Difficulty 50 (College)
The elements of bacteriological technique : $b a laboratory guide for medical, dental, and technical students
Eyre, J. W. H. (John William Henry)
7,725 Gutenberg downloadsen2009Difficulty 59 (Graduate)
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
Masters, Maxwell T. (Maxwell Tylden)
7,605 Gutenberg downloadsen2007Difficulty 61 (Academic)
Cattle and Their Diseases Embracing Their History and Breeds, Crossing and Breeding, and Feeding and Management; with the Diseases to Which They Are Subject, and the Remedies Best Adapted to Their Cure
Jennings, Robert
7,140 Gutenberg downloadsen2007Difficulty 67 (Academic)
Explanation of Terms Used in Entomology
Smith, John Bernhard
6,893 Gutenberg downloadsen2007Difficulty 57 (Graduate)
The Theories of Darwin and Their Relation to Philosophy, Religion, and Morality
Schmid, Rudolf
6,104 Gutenberg downloadsen2007Difficulty 56 (Graduate)
The Origin of Species by Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life, 6th Edition
Darwin, Charles
5,810 Gutenberg downloadsen1999Difficulty 65 (Academic)
Evolution, Old & New Or, the Theories of Buffon, Dr. Erasmus Darwin and Lamarck, as compared with that of Charles Darwin
Butler, Samuel
5,746 Gutenberg downloadsen2007Difficulty 57 (Graduate)
Contributions to the Theory of Natural Selection A Series of Essays
Wallace, Alfred Russel
5,537 Gutenberg downloadsen2007Difficulty 63 (Academic)
The Variation of Animals and Plants Under Domestication, Vol. I.
Darwin, Charles
5,235 Gutenberg downloadsen2008Difficulty 67 (Academic)
Delineations of the Ox Tribe: The Natural History of Bulls, Bisons, and Buffaloes. Exhibiting all the Known Species and the More Remarkable Varieties of the Genus Bos.
Vasey, George
5,074 Gutenberg downloadsen2009Difficulty 57 (Graduate)
The Medicinal Plants of the Philippines
Pardo de Tavera, T. H. (Trinidad Hermenegildo)
4,922 Gutenberg downloadsen2008Difficulty 67 (Academic)
Zoölogische Philosophie Of beschouwingen over de Natuurlijke Historie der dieren etc.
Lamarck, Jean Baptiste Pierre Antoine de Monet de
4,299 Gutenberg downloadsnl2008
Mysteries of Bee-keeping Explained
Quinby, M. (Moses)
4,144 Gutenberg downloadsen2008Difficulty 78 (Expert)
Sir Jagadis Chunder Bose, His Life and Speeches
Bose, Jagadis Chandra
4,118 Gutenberg downloadsen2007Difficulty 65 (Academic)
Insects and Diseases A Popular Account of the Way in Which Insects may Spread or Cause some of our Common Diseases
Doane, Rennie Wilbur
3,981 Gutenberg downloadsen2009Difficulty 58 (Graduate)
The book of wonders : $b gives plain and simple answers to the thousands of everyday questions that are asked and which all should be able to, but cannot answer...
Unknown
3,941 Gutenberg downloadsen2025Difficulty 48 (College)
Birds of the Rockies
Keyser, Leander S. (Leander Sylvester)
3,590 Gutenberg downloadsen2008Difficulty 58 (Graduate)
On the Origin of Species by Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life. (2nd edition)
Darwin, Charles
3,543 Gutenberg downloadsen2007Difficulty 73 (Expert)
The Descent of Man, and Selection in Relation to Sex
Darwin, Charles
3,508 Gutenberg downloadsen2000Difficulty 69 (Academic)
Herbal simples approved for modern uses of cure
Fernie, William Thomas
3,468 Gutenberg downloadsen2006Difficulty 54 (Graduate)
The Voyage of the Beagle
Darwin, Charles
3,310 Gutenberg downloadsen1997Difficulty 56 (Graduate)
Darwin, and After Darwin, Volumes 1 and 3 An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions
Romanes, George John
3,258 Gutenberg downloadsen2008Difficulty 55 (Graduate)
An Elementary Study of Insects
Haseman, Leonard
3,253 Gutenberg downloadsen2007Difficulty 51 (Graduate)
The Stock-Feeder's Manual the chemistry of food in relation to the breeding and feeding of live stock
Cameron, Charles Alexander, Sir
2,942 Gutenberg downloadsen2008Difficulty 59 (Graduate)
The Expression of the Emotions in Man and Animals
Darwin, Charles
2,909 Gutenberg downloadsen1998Difficulty 64 (Academic)
The Foundations of the Origin of Species Two Essays written in 1842 and 1844
Darwin, Charles
2,880 Gutenberg downloadsen2007Difficulty 56 (Graduate)
American Weasels
Hall, E. Raymond (Eugene Raymond)
2,717 Gutenberg downloadsen2013Difficulty 63 (Academic)
On Growth and Form
Thompson, D'Arcy Wentworth
2,717 Gutenberg downloadsen2017Difficulty 53 (Graduate)
Makers of British Botany; a collection of biographies by living botanists
Unknown
2,715 Gutenberg downloadsen2014Difficulty 61 (Academic)
Evolution in Modern Thought
Unknown
2,663 Gutenberg downloadsen2007Difficulty 73 (Expert)
The Dawn of Reason; or, Mental Traits in the Lower Animals
Weir, James, Jr.
2,661 Gutenberg downloadsen2007Difficulty 70 (Academic)
Outlines of Dairy Bacteriology, 8th edition A Concise Manual for the Use of Students in Dairying
Russell, H. L. (Harry Luman)
2,616 Gutenberg downloadsen2009Difficulty 62 (Academic)
The Evolution of Man
Haeckel, Ernst
2,221 Gutenberg downloadsen2005Difficulty 49 (College)
Identification of the Larger Fungi
Watling, Roy
2,090 Gutenberg downloadsen2019Difficulty 62 (Academic)
Micrographia Some Physiological Descriptions of Minute Bodies Made by Magnifying Glasses with Observations and Inquiries Thereupon
Hooke, Robert
2,082 Gutenberg downloadsen2005Difficulty 76 (Expert)
Encyclopaedia Britannica, 11th Edition, "Ichthyology" to "Independence" Volume 14, Slice 3
Various
2,037 Gutenberg downloadsen2012Difficulty 67 (Academic)
The Natural History of Pliny, Volume 5 (of 6)
Pliny, the Elder
1,999 Gutenberg downloadsen2019Difficulty 50 (College)
Freedom in Science and Teaching. from the German of Ernst Haeckel
Haeckel, Ernst
1,994 Gutenberg downloadsen2008Difficulty 73 (Expert)
The Journal of a Disappointed Man
Barbellion, W. N. P.
1,989 Gutenberg downloadsen2012Difficulty 42 (College)
Man And His Ancestor: A Study In Evolution
Morris, Charles
1,979 Gutenberg downloadsen2009Difficulty 58 (Graduate)
Rollo's Experiments
Abbott, Jacob
1,905 Gutenberg downloadsen2008Difficulty 35 (High School)
The Genus Pinus
Shaw, George Russell
1,905 Gutenberg downloadsen2008Difficulty 58 (Graduate)
The Animal Parasites of Man
Fantham, Harold Benjamin & Braun, Max & Stephens, J. W. W. (John William Watson) & Theobald, Fred. V. (Frederick Vincent)
1,897 Gutenberg downloadsen2018Difficulty 67 (Academic)
Aristotle's History of Animals In Ten Books
Aristotle
1,869 Gutenberg downloadsen2019Difficulty 55 (Graduate)
The Story-book of Science
Fabre, Jean-Henri
1,784 Gutenberg downloadsen2018Difficulty 43 (College)
Vestiges of the Natural History of Creation
Chambers, Robert
1,776 Gutenberg downloadsen2004Difficulty 66 (Academic)
Handbook of Birmingham Prepared for the Members of the British Association, 1886
British Association for the Advancement of Science
1,756 Gutenberg downloadsen2015Difficulty 51 (Graduate)
Origin of Cultivated Plants The International Scientific Series Volume XLVIII
Candolle, Alphonse de
1,734 Gutenberg downloadsen2014Difficulty 62 (Academic)
At the Deathbed of Darwinism: A Series of Papers
Dennert, Eberhard
1,728 Gutenberg downloadsen2007Difficulty 68 (Academic)
The Principles of Biology, Volume 1 (of 2)
Spencer, Herbert
1,716 Gutenberg downloadsen2017Difficulty 63 (Academic)
The Common Spiders of the United States
Emerton, J. H. (James Henry)
1,701 Gutenberg downloadsen2013Difficulty 45 (College)
Are the Effects of Use and Disuse Inherited? An Examination of the View Held by Spencer and Darwin
Ball, W. P. (William Platt)
1,673 Gutenberg downloadsen2008Difficulty 68 (Academic)
The Glow-Worm and Other Beetles
Fabre, Jean-Henri
1,672 Gutenberg downloadsen2009Difficulty 50 (College)
A text-book of veterinary anatomy
Sisson, Septimus
1,653 Gutenberg downloadsen2025Difficulty 76 (Expert)
Species Plantarum, Sections IV-V
Linné, Carl von
1,606 Gutenberg downloadsla2008
Encyclopaedia Britannica, 11th Edition, "Matter" to "Mecklenburg" Volume 17, Slice 8
Various
1,594 Gutenberg downloadsen2013Difficulty 71 (Expert)
Het Leven der Dieren: Deel 1, Hoofdstuk 01: De Apen
Brehm, Alfred Edmund
1,587 Gutenberg downloadsnl2005
The Autobiography of Charles Darwin
Darwin, Charles
1,587 Gutenberg downloadsen1999Difficulty 53 (Graduate)
Toadstools, mushrooms, fungi, edible and poisonous; one thousand American fungi How to select and cook the edible; how to distinguish and avoid the poisonous, with full botanic descriptions. Toadstool poisons and their treatment, instructions to students, recipes for cooking, etc., etc.
McIlvaine, Charles & Macadam, Robert K.
1,571 Gutenberg downloadsen2016Difficulty 54 (Graduate)
Evidence as to Man's Place in Nature
Huxley, Thomas Henry
1,560 Gutenberg downloadsen2001Difficulty 56 (Graduate)
Himalayan Journals — Complete Or, Notes of a Naturalist in Bengal, the Sikkim and Nepal Himalayas, the Khasia Mountains, etc.
Hooker, Joseph Dalton
1,560 Gutenberg downloadsen2004Difficulty 99 (Quantum Electrodynamics)
Journal of Researches into the Natural History and Geology of the Countries Visited During the Voyage Round the World of H.M.S. Beagle Under the Command of Captain Fitz Roy, R.N.
Darwin, Charles
1,551 Gutenberg downloadsen2003Difficulty 66 (Academic)
Encyclopaedia Britannica, 11th Edition, "Echinoderma" to "Edward, prince of Wales" Volume 8, Slice 10
Various
1,536 Gutenberg downloadsen2011Difficulty 65 (Academic)
Mammals of Washington, Volume 2 University of Kansas Publications Museum of Natural History
Dalquest, Walter Woelber
1,523 Gutenberg downloadsen2016Difficulty 52 (Graduate)
The Book of the Pearl The history, art, science, and industry of the queen of gems
Kunz, George Frederick & Stevenson, Charles Hugh
1,508 Gutenberg downloadsen2020Difficulty 64 (Academic)
The Biotic Associations of Cockroaches
Roth, Louis M. (Louis Marcus) & Willis, Edwin R.
1,507 Gutenberg downloadsen2014Difficulty 71 (Expert)
Cavity-Nesting Birds of North American Forests Agriculture Handbook 511
Scott, Virgil E. & Evans, Keith E. & Patton, David R. & Stone, Charles P.
1,474 Gutenberg downloadsen2015Difficulty 64 (Academic)
Encyclopaedia Britannica, 11th Edition, "Joints" to "Justinian I." Volume 15, Slice 5
Various
1,472 Gutenberg downloadsen2012Difficulty 65 (Academic)
Pharmacographia A history of the principal drugs of vegetable origin, met with in Great Britain and British India
Flückiger, Friedrich A. (Friedrich August) & Hanbury, Daniel
1,430 Gutenberg downloadsen2022Difficulty 66 (Academic)
Prof. Koch's Method to Cure Tuberculosis Popularly Treated
Birnbaum, Max
1,430 Gutenberg downloadsen2008Difficulty 59 (Graduate)
A system of practical medicine. By American authors. Vol. 1 : $b Pathology and general diseases
Unknown
1,419 Gutenberg downloadsen2012Difficulty 63 (Academic)
Fabre's Book of Insects
Fabre, Jean-Henri
1,418 Gutenberg downloadsen2021Difficulty 43 (College)
Life and Letters of Charles Darwin — Volume 2
Darwin, Charles
1,418 Gutenberg downloadsen2000Difficulty 53 (Graduate)
Mutual Aid: A Factor of Evolution
Kropotkin, Petr Alekseevich, kniaz
1,401 Gutenberg downloadsen2003Difficulty 73 (Expert)
Cosmos: A Sketch of the Physical Description of the Universe, Vol. 1
Humboldt, Alexander von
1,399 Gutenberg downloadsen2005Difficulty 67 (Academic)
The Sea-beach at Ebb-tide A Guide to the Study of the Seaweeds and the Lower Animal Life Found Between Tide-marks
Arnold, Augusta Foote
1,391 Gutenberg downloadsen2013Difficulty 57 (Graduate)
Encyclopaedia Britannica, 11th Edition, "Foraminifera" to "Fox, Edward" Volume 10, Slice 6
Various
1,387 Gutenberg downloadsen2011Difficulty 67 (Academic)
Galen: On the Natural Faculties
Galen
1,378 Gutenberg downloadsen2013Difficulty 65 (Academic)
American Forest Trees
Gibson, Henry H.
1,371 Gutenberg downloadsen2013Difficulty 50 (College)
The Life of the Spider
Fabre, Jean-Henri
1,366 Gutenberg downloadsen1999Difficulty 52 (Graduate)
Butterflies and Moths (British)
Furneaux, William S.
1,348 Gutenberg downloadsen2010Difficulty 44 (College)
A Guide to the Study of Fishes, Volume 2 (of 2)
Jordan, David Starr
1,320 Gutenberg downloadsen2016Difficulty 83 (Specialist)
Tobacco; Its History, Varieties, Culture, Manufacture and Commerce
Billings, E. R.
1,317 Gutenberg downloadsen2008Difficulty 60 (Graduate)
Manual of the Trees of North America (Exclusive of Mexico) 2nd ed.
Sargent, Charles Sprague
1,313 Gutenberg downloadsen2014Difficulty 78 (Expert)
The Cambridge natural history, Vol. 06 (of 10)
Sharp, David
1,307 Gutenberg downloadsen2023Difficulty 65 (Academic)
The Insect World Being a Popular Account of the Orders of Insects; Together with a Description of the Habits and Economy of Some of the Most Interesting Species
Figuier, Louis
1,293 Gutenberg downloadsen2014Difficulty 55 (Graduate)
Darwin and Modern Science
Seward, A. C. (Albert Charles)
1,272 Gutenberg downloadsen1999Difficulty 56 (Graduate)
The Bird Book Illustrating in natural colors more than seven hundred North American birds; also several hundred photographs of their nests and eggs.
Reed, Chester A. (Chester Albert)
1,270 Gutenberg downloadsen2009Difficulty 47 (College)
The Malay Archipelago, Volume 1 The Land of the Orang-utan and the Bird of Paradise; A Narrative of Travel, with Studies of Man and Nature
Wallace, Alfred Russel
1,262 Gutenberg downloadsen2001Difficulty 63 (Academic)
Wild Flowers An Aid to Knowledge of Our Wild Flowers and Their Insect Visitors
Blanchan, Neltje
1,260 Gutenberg downloadsen2002Difficulty 58 (Graduate)
The Descent of Man and Selection in Relation to Sex, Vol. I
Darwin, Charles
1,255 Gutenberg downloadsen2011Difficulty 65 (Academic)
The Evolution Theory, Vol. 1 of 2
Weismann, August
1,255 Gutenberg downloadsen2021Difficulty 59 (Graduate)
How to Use the Popular Science Library; History of Science; General Index
Serviss, Garrett Putman & Selwyn-Brown, Arthur
1,244 Gutenberg downloadsen2016Difficulty 64 (Academic)
The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told
Thomson, J. Arthur (John Arthur)
1,241 Gutenberg downloadsen2007Difficulty 66 (Academic)
Snakes: Curiosities and Wonders of Serpent Life
Hopley, Catherine Cooper
1,240 Gutenberg downloadsen2016Difficulty 56 (Graduate)
Fossil plants, Vol. 3 : $b A text-book for students of botany and geology
Seward, A. C. (Albert Charles)
1,236 Gutenberg downloadsen2025Difficulty 64 (Academic)
Birds useful and birds harmful
Herman, Ottó & Owen, J. A. (Jean Allan)
1,222 Gutenberg downloadsen2016Difficulty 56 (Graduate)
Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1
Humboldt, Alexander von & Bonpland, Aimé
1,217 Gutenberg downloadsen2004Difficulty 55 (Graduate)
The life of Jean Henri Fabre, the entomologist, 1823-1910
Fabre, Augustin
1,204 Gutenberg downloadsen2024Difficulty 58 (Graduate)
Australian insects
Froggatt, Walter W. (Walter Wilson)
1,198 Gutenberg downloadsen2025Difficulty 52 (Graduate)
Cassell's Natural History, Vol. 1 (of 6)
Unknown
1,189 Gutenberg downloadsen2017Difficulty 94 (Quantum Electrodynamics)
The plums of New York
Hedrick, U. P.
1,188 Gutenberg downloadsen2024Difficulty 65 (Academic)
Reptiles and Birds A Popular Account of Their Various Orders, With a Description of the Habits and Economy of the Most Interesting
Figuier, Louis
1,187 Gutenberg downloadsen2014Difficulty 79 (Expert)
The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee
Gray, Asa
1,184 Gutenberg downloadsen2012Difficulty 60 (Graduate)
The Homing Pigeon
United States. Army. Signal Corps & United States. War Department
1,182 Gutenberg downloadsen2017Difficulty 51 (Graduate)
Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)
Burkett, Ray D.
1,180 Gutenberg downloadsen2011Difficulty 63 (Academic)
Studies in the History and Method of Science, vol. 1 (of 2)
Unknown
1,171 Gutenberg downloadsen2014Difficulty 57 (Graduate)
Travels in Peru and India While Superintending the Collection of Chinchona Plants and Seeds in South America, and Their Introduction into India.
Markham, Clements R. (Clements Robert), Sir
1,168 Gutenberg downloadsen2017Difficulty 62 (Academic)
A Text-book of Entomology Including the Anatomy, Physiology, Embryology and Metamorphoses of Insects for Use in Agricultural and Technical Schools and Colleges as Well as by the Working Entomologist
Packard, A. S. (Alpheus Spring)
1,167 Gutenberg downloadsen2021Difficulty 63 (Academic)
History of the Conflict Between Religion and Science
Draper, John William
1,164 Gutenberg downloadsen1998Difficulty 62 (Academic)
Sketches of the Natural History of Ceylon
Tennent, James Emerson, Sir
1,164 Gutenberg downloadsen2004Difficulty 72 (Expert)
The Cambridge natural history, Vol. 01 (of 10)
Hartog, Marcus & Hickson, Sydney J. (Sydney John) & MacBride, E. W. (Ernest William) & Sollas, Igerna Brünhilda Johnson
1,161 Gutenberg downloadsen2023Difficulty 71 (Expert)
Man's Place in Nature, and Other Essays
Huxley, Thomas Henry
1,159 Gutenberg downloadsen2012Difficulty 65 (Academic)
Zoonomia; Or, the Laws of Organic Life, Vol. I
Darwin, Erasmus
1,155 Gutenberg downloadsen2005Difficulty 64 (Academic)
Charles Darwin: His Life Told in an Autobiographical Chapter, and in a Selected Series of His Published Letters
Darwin, Charles
1,150 Gutenberg downloadsen2012Difficulty 53 (Graduate)
The Variation of Animals and Plants under Domestication
Darwin, Charles
1,141 Gutenberg downloadsen2002Difficulty 86 (Specialist)
Life histories of North American wood warblers, Part 1 (of 2)
Bent, Arthur Cleveland
1,138 Gutenberg downloadsen2012Difficulty 66 (Academic)
The anatomy of the domestic fowl
Kaupp, B. F. (Benjamin Franklyn)
1,136 Gutenberg downloadsen2023Difficulty 65 (Academic)
More Letters of Charles Darwin — Volume 2 A Record of His Work in a Series of Hitherto Unpublished Letters
Darwin, Charles
1,134 Gutenberg downloadsen2001Difficulty 50 (College)
The Cambridge natural history, Vol. 08 (of 10)
Gadow, Hans
1,132 Gutenberg downloadsen2024Difficulty 63 (Academic)
Clever Hans (The Horse of Mr. Von Osten) A contribution to experimental animal and human psychology
Pfungst, Oskar
1,129 Gutenberg downloadsen2010Difficulty 58 (Graduate)
The Naturalist on the River Amazons
Bates, Henry Walter
1,127 Gutenberg downloadsen2000Difficulty 67 (Academic)
The Birds of Washington (Volume 1 of 2) A complete, scientific and popular account of the 372 species of birds found in the state
Dawson, William Leon & Bowles, John Hooper
1,126 Gutenberg downloadsen2014Difficulty 58 (Graduate)
Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, First Part: Porulosa (Spumellaria and Acantharia) Report on the Scientific Results of the Voyage of H.M.S. Challenger During the Years 1873-76, Vol. XVIII
Haeckel, Ernst
1,124 Gutenberg downloadsen2013Difficulty 64 (Academic)
The works of Francis Maitland Balfour, Volume 3 (of 4) : $b A treatise on comparative embryology: Vertebrata
Balfour, Francis M. (Francis Maitland)
1,121 Gutenberg downloadsen2014Difficulty 54 (Graduate)
Cassell's Natural History, Vol. 2 (of 6)
Unknown
1,119 Gutenberg downloadsen2019Difficulty 99 (Quantum Electrodynamics)
Handbuch der Pharmakognosie : $b Zweiter Band. Spezielle Pharmakognosie
Tschirch, A. (Alexander)
1,116 Gutenberg downloadsde2023
The Elements of Botany, For Beginners and For Schools
Gray, Asa
1,113 Gutenberg downloadsen2010Difficulty 57 (Graduate)
Man, Past and Present
Keane, A. H. (Augustus Henry)
1,109 Gutenberg downloadsen2011Difficulty 60 (Graduate)
The Vertebrate Skeleton
Reynolds, Sidney H. (Sidney Hugh)
1,107 Gutenberg downloadsen2013Difficulty 64 (Academic)
General Anatomy, Applied to Physiology and Medicine, Vol. 1 (of 3)
Bichat, Xavier
1,100 Gutenberg downloadsen2017Difficulty 67 (Academic)
The Sacred Beetle, and Others
Fabre, Jean-Henri
1,096 Gutenberg downloadsen2021Difficulty 56 (Graduate)
Parasites: A Treatise on the Entozoa of Man and Animals Including Some Account of the Ectozoa
Cobbold, T. Spencer (Thomas Spencer)
1,091 Gutenberg downloadsen2014Difficulty 60 (Graduate)
The Progress of the Century
Unknown
1,089 Gutenberg downloadsen2017Difficulty 69 (Academic)
The Moths of the British Isles, First Series Comprising the Families Sphingidæ to Noctuidæ
South, Richard
1,083 Gutenberg downloadsen2013Difficulty 54 (Graduate)
A Guide to the Study of Fishes, Volume 1 (of 2)
Jordan, David Starr
1,081 Gutenberg downloadsen2014Difficulty 66 (Academic)
Artistic Anatomy of Animals
Cuyer, Édouard
1,081 Gutenberg downloadsen2011Difficulty 54 (Graduate)
Form and Function: A Contribution to the History of Animal Morphology
Russell, E. S. (Edward Stuart)
1,081 Gutenberg downloadsen2007Difficulty 59 (Graduate)
Applied Eugenics
Popenoe, Paul & Johnson, Roswell H. (Roswell Hill)
1,070 Gutenberg downloadsen2006Difficulty 55 (Graduate)
Life histories of North American shore birds, Part 1 (of 2)
Bent, Arthur Cleveland
1,070 Gutenberg downloadsen2014Difficulty 62 (Academic)
The Power of Movement in Plants
Darwin, Charles & Darwin, Francis, Sir
1,065 Gutenberg downloadsen2004Difficulty 70 (Academic)
The Cambridge natural history, Vol. 07 (of 10)
Boulenger, George Albert & Bridge, T. W. (Thomas William) & Herdman, W. A. (William Abbott), Sir
1,062 Gutenberg downloadsen2024Difficulty 76 (Expert)
Botany: The Science of Plant Life
Taylor, Norman
1,054 Gutenberg downloadsen2015Difficulty 56 (Graduate)
The Cambridge natural history, Vol. 10 (of 10)
Beddard, Frank E. (Frank Evers)
1,052 Gutenberg downloadsen2012Difficulty 61 (Academic)
Forest Trees of Texas: How to Know Them
Mattoon, Wilbur R. (Wilbur Reed) & Webster, C. B. (Cyril Bertram)
1,051 Gutenberg downloadsen2016Difficulty 56 (Graduate)
Fungi: Their Nature and Uses
Cooke, M. C. (Mordecai Cubitt)
1,048 Gutenberg downloadsen2009Difficulty 57 (Graduate)
Insectivorous Plants
Darwin, Charles
1,048 Gutenberg downloadsen2004Difficulty 63 (Academic)
Bass, Pike, Perch, and Others
Henshall, James A. (James Alexander)
1,043 Gutenberg downloadsen2012Difficulty 57 (Graduate)
The Glands Regulating Personality A Study of the Glands of Internal Secretion in Relation to the Types of Human Nature
Berman, Louis
1,043 Gutenberg downloadsen2003Difficulty 58 (Graduate)
Animal Behaviour
Morgan, C. Lloyd (Conwy Lloyd)
1,041 Gutenberg downloadsen2017Difficulty 56 (Graduate)
Darwinism (1889) An exposition of the theory of natural selection, with some of its applications
Wallace, Alfred Russel
1,041 Gutenberg downloadsen2005Difficulty 82 (Specialist)
The pears of New York
Hedrick, U. P.
1,041 Gutenberg downloadsen2014Difficulty 58 (Graduate)
Elementary Zoology, Second Edition
Kellogg, Vernon L. (Vernon Lyman)
1,033 Gutenberg downloadsen2012Difficulty 57 (Graduate)
The Life of the Fly; With Which are Interspersed Some Chapters of Autobiography
Fabre, Jean-Henri
1,030 Gutenberg downloadsen2002Difficulty 54 (Graduate)
The Science of Fingerprints: Classification and Uses
United States. Federal Bureau of Investigation
1,029 Gutenberg downloadsen2006Difficulty 61 (Academic)
British birds
Hudson, W. H. (William Henry) & Beddard, Frank E. (Frank Evers)
1,028 Gutenberg downloadsen2024Difficulty 67 (Academic)
Philosophical Transactions of the Royal Society - Vol 1 - 1666 Giving some Accompt of the present Undertakings, Studies, and Labours of the Ingenious in many considerable parts of the World
Various
1,026 Gutenberg downloadsen2009Difficulty 57 (Graduate)
Life and Matter: A Criticism of Professor Haeckel's "Riddle of the Universe"
Lodge, Oliver, Sir
1,022 Gutenberg downloadsen2008Difficulty 75 (Expert)
The Cambridge natural history, Vol. 03 (of 10)
Cooke, A. H. (Alfred Hands) & Reed, F. R. C. (Frederick Richard Cowper)
1,021 Gutenberg downloadsen2023Difficulty 63 (Academic)
The Prolongation of Life: Optimistic Studies
Metchnikoff, Elie
1,018 Gutenberg downloadsen2016Difficulty 58 (Graduate)
The Nature of Animal Light
Harvey, E. Newton (Edmund Newton)
1,014 Gutenberg downloadsen2010Difficulty 71 (Expert)
North American Recent Soft-Shelled Turtles (Family Trionychidae)
Webb, Robert G. (Robert Gravem)
1,012 Gutenberg downloadsen2012Difficulty 71 (Expert)
A History of North American Birds; Land Birds; Vol. 3 of 3
Baird, Spencer Fullerton & Brewer, T. M. (Thomas Mayo) & Ridgway, Robert
1,007 Gutenberg downloadsen2017Difficulty 59 (Graduate)
Herbals, Their Origin and Evolution: A Chapter in the History of Botany 1470-1670
Arber, Agnes Robertson
1,005 Gutenberg downloadsen2014Difficulty 55 (Graduate)
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740 Gutenberg downloadsen2023Difficulty 48 (College)
Scientific American Supplement, No. 841, February 13, 1892
Various
739 Gutenberg downloadsen2005Difficulty 52 (Graduate)
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Darwin, Charles
737 Gutenberg downloadsen2001Difficulty 57 (Graduate)
The Cambridge natural history, Vol. 09 (of 10)
Evans, A. H. (Arthur Humble)
737 Gutenberg downloadsen2024Difficulty 59 (Graduate)
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Martin, René
736 Gutenberg downloadsfr2017
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Clark, Bertha May
736 Gutenberg downloadsen2005Difficulty 53 (Graduate)
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Calman, W. T. (William Thomas)
736 Gutenberg downloadsen2012Difficulty 51 (Graduate)
On the mode of communication of cholera
Snow, John
735 Gutenberg downloadsen2024Difficulty 58 (Graduate)
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Law, James
734 Gutenberg downloadsen2023Difficulty 66 (Academic)
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Scharff, R. F. (Robert Francis)
729 Gutenberg downloadsen2010Difficulty 61 (Academic)
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Wallace, Alfred Russel & Marchant, James, Sir
728 Gutenberg downloadsen2005Difficulty 65 (Academic)
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Gosse, Philip Henry
725 Gutenberg downloadsen2010Difficulty 76 (Expert)
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Haeckel, Ernst
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What is Darwinism?
Hodge, Charles
724 Gutenberg downloadsen2006Difficulty 53 (Graduate)
A Monograph on the Sub-class Cirripedia (Volume 2 of 2) The Balanidæ, (or Sessile Cirripedes); the Verrucidæ, etc., etc.
Darwin, Charles
721 Gutenberg downloadsen2014Difficulty 57 (Graduate)
The human species
Quatrefages, A. de (Armand de)
721 Gutenberg downloadsen2023Difficulty 56 (Graduate)
A Review of the Systems of Ethics Founded on the Theory of Evolution
Williams, Cora May
720 Gutenberg downloadsen2012Difficulty 100 (Quantum Electrodynamics)
Life Movements in Plants, Volume I
Bose, Jagadis Chandra
720 Gutenberg downloadsen2015Difficulty 69 (Academic)
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Lincoln, Frederick Charles & Peterson, Steven R.
719 Gutenberg downloadsen2021Difficulty 68 (Academic)
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Wood, J. G. (John George)
717 Gutenberg downloadsen2016Difficulty 51 (Graduate)
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Drury, Dru
716 Gutenberg downloadsen2014Difficulty 55 (Graduate)
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Ray, John & Rauwolf, Leonhard
715 Gutenberg downloadsen2025Difficulty 57 (Graduate)
The Fantastic Clan: The Cactus Family
Thornber, J. J. (John James) & Bonker, Frances
714 Gutenberg downloadsen2014Difficulty 67 (Academic)
Life and Letters of Thomas Henry Huxley — Volume 1
Huxley, Thomas Henry
712 Gutenberg downloadsen2004Difficulty 58 (Graduate)
European Fungus Flora: Agaricaceae
Massee, George
711 Gutenberg downloadsen2010Difficulty 48 (College)
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Shaler, Nathaniel Southgate
709 Gutenberg downloadsen2008Difficulty 63 (Academic)
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Rothschild, Lionel Walter Rothschild, Baron
709 Gutenberg downloadsen2012Difficulty 55 (Graduate)
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Darwin, Charles
709 Gutenberg downloadsen2001Difficulty 60 (Graduate)
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Carpenter, George H. (George Herbert)
708 Gutenberg downloadsen2005Difficulty 57 (Graduate)
The Breath of Life
Burroughs, John
707 Gutenberg downloadsen2006Difficulty 57 (Graduate)
The Physical Basis of Mind Being the Second Series of Problems of Life and Mind.
Lewes, George Henry
707 Gutenberg downloadsen2019Difficulty 70 (Academic)
Biographies of distinguished scientific men. First series
Arago, F. (François)
706 Gutenberg downloadsen2005Difficulty 52 (Graduate)
Aphorisms and Reflections from the Works of T. H. Huxley
Huxley, Thomas Henry
704 Gutenberg downloadsen2011Difficulty 60 (Graduate)
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Matthew, William Diller
704 Gutenberg downloadsen2006Difficulty 59 (Graduate)
Animal intelligence: Experimental studies
Thorndike, Edward L. (Edward Lee)
702 Gutenberg downloadsen2023Difficulty 65 (Academic)
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Leduc, Stéphane
702 Gutenberg downloadsen2010Difficulty 63 (Academic)
American Pomology. Apples
Warder, J. A. (John Aston)
701 Gutenberg downloadsen2011Difficulty 64 (Academic)
Secrets of Earth and Sea
Lankester, E. Ray (Edwin Ray), Sir
701 Gutenberg downloadsen2016Difficulty 53 (Graduate)
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Lungwitz, A. (Anton)
700 Gutenberg downloadsen2021Difficulty 55 (Graduate)
Abstracts of Papers Read at the First International Eugenics Congress University of London, July, 1912
International Eugenics Congress (1st : 1912 : London)
700 Gutenberg downloadsen2014Difficulty 65 (Academic)
Proserpina, Volume 1 Studies of Wayside Flowers, While the Air was Yet Pure Among the Alps and in the Scotland and England Which My Father Knew
Ruskin, John
700 Gutenberg downloadsen2007Difficulty 52 (Graduate)
Studies in the Theory of Descent, Volume I
Weismann, August
700 Gutenberg downloadsen2015Difficulty 68 (Academic)
British Pomology Or, the History, Description, Classification, and Synonymes, of the Fruits and Fruit Trees of Great Britain
Hogg, Robert
699 Gutenberg downloadsen2014Difficulty 58 (Graduate)
Argentine Ornithology, Volume 1 (of 2) A descriptive catalogue of the birds of the Argentine Republic.
Sclater, Philip Lutley & Hudson, W. H. (William Henry)
698 Gutenberg downloadsen2012Difficulty 62 (Academic)
Fossil plants, Vol. 1 : $b [A text-book] for students of botany and geology
Seward, A. C. (Albert Charles)
698 Gutenberg downloadsen2022Difficulty 57 (Graduate)
The Book of Love
Mantegazza, Paolo
698 Gutenberg downloadsen2018Difficulty 72 (Expert)
The Variation of Animals and Plants under Domestication — Volume 2
Darwin, Charles
698 Gutenberg downloadsen2001Difficulty 72 (Expert)
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Law, James
696 Gutenberg downloadsen2024Difficulty 69 (Academic)
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695 Gutenberg downloadsen2019Difficulty 59 (Graduate)
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Smith, Annie Lorrain
694 Gutenberg downloadsen2020Difficulty 52 (Graduate)
On the Genesis of Species
Mivart, St. George Jackson
694 Gutenberg downloadsen2007Difficulty 63 (Academic)
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Fabre, Jean-Henri
694 Gutenberg downloadsen2021Difficulty 50 (College)
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Miall, L. C. (Louis Compton) & Denny, Alfred
694 Gutenberg downloadsen2016Difficulty 58 (Graduate)
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Jones, J. Knox
693 Gutenberg downloadsen2010Difficulty 58 (Graduate)
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Leach, John Albert
692 Gutenberg downloadsen2010Difficulty 51 (Graduate)
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Adams, George
692 Gutenberg downloadsen2020Difficulty 62 (Academic)
Insect life: Souvenirs of a naturalist
Fabre, Jean-Henri
692 Gutenberg downloadsen2022Difficulty 51 (Graduate)
Letters of Asa Gray; Vol. 1
Gray, Asa
692 Gutenberg downloadsen2017Difficulty 49 (College)
The Dinosaur Quarry. Dinosaur National Monument, Colorado-Utah
Good, John M. (John Maxwell) & Stucker, Gilbert F. & White, Theodore Elmer
692 Gutenberg downloadsen2015Difficulty 54 (Graduate)
The Crayfish: An Introduction to the Study of Zoology.
Huxley, Thomas Henry
691 Gutenberg downloadsen2019Difficulty 54 (Graduate)
Pioneers of Evolution from Thales to Huxley With an Intermediate Chapter on the Causes of Arrest of the Movement
Clodd, Edward
689 Gutenberg downloadsen2012Difficulty 58 (Graduate)
The Life of the Caterpillar
Fabre, Jean-Henri
689 Gutenberg downloadsen2021Difficulty 51 (Graduate)
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Rangachari, K. & Tadulinga Mudaliyar, C.
688 Gutenberg downloadsen2007Difficulty 50 (College)
Essays Upon Heredity and Kindred Biological Problems Authorised Translation
Weismann, August
688 Gutenberg downloadsen2015Difficulty 58 (Graduate)
Speciation in the Brazilian Spiny Rats
Moojen, João
688 Gutenberg downloadsen2013Difficulty 70 (Academic)
The Botanical Magazine, Vol. 06 Or, Flower-Garden Displayed
Curtis, William
688 Gutenberg downloadsen2007Difficulty 59 (Graduate)
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Fabre, Jean-Henri & Teixeira de Mattos, Alexander
688 Gutenberg downloadsen2021Difficulty 49 (College)
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Fabre, Jean-Henri
687 Gutenberg downloadsen2002Difficulty 52 (Graduate)
British Bees An Introduction into the Studies of the Natural History and Economy of the Bees Indigenous to the British Isles
Shuckard, William Edward
687 Gutenberg downloadsen2017Difficulty 72 (Expert)
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Atkinson, George Francis
687 Gutenberg downloadsen2021Difficulty 53 (Graduate)
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Furneaux, William S.
687 Gutenberg downloadsen2013Difficulty 52 (Graduate)
Island Life; Or, The Phenomena and Causes of Insular Faunas and Floras
Wallace, Alfred Russel
687 Gutenberg downloadsen2010Difficulty 89 (Specialist)
General Anatomy, Applied to Physiology and Medicine, Vol. 2 (of 3)
Bichat, Xavier
686 Gutenberg downloadsen2017Difficulty 61 (Academic)
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Haeckel, Ernst
686 Gutenberg downloadsen2004Difficulty 52 (Graduate)
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Ormerod, Eleanor A. (Eleanor Anne)
684 Gutenberg downloadsen2020Difficulty 76 (Expert)
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Bateson, William
683 Gutenberg downloadsen2014Difficulty 65 (Academic)
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Fabre, Jean-Henri
683 Gutenberg downloadsen2022Difficulty 50 (College)
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Bechstein, Johann Matthäus
683 Gutenberg downloadsen2012Difficulty 56 (Graduate)
The useful trees of northern Nigeria
Lely, Hugh Vandervaes
683 Gutenberg downloadsen2023Difficulty 56 (Graduate)
The Variation of Animals and Plants Under Domestication, Volume II (of 2)
Darwin, Charles
682 Gutenberg downloadsen2009Difficulty 73 (Expert)
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Thatcher, Roscoe Wilfred
681 Gutenberg downloadsen2010Difficulty 88 (Specialist)
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Darwin, Charles
681 Gutenberg downloadsen2003Difficulty 62 (Academic)
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Deam, Charles Clemon
680 Gutenberg downloadsen2012Difficulty 50 (College)
A History of Science — Volume 2
Williams, Henry Smith & Williams, Edward Huntington
679 Gutenberg downloadsen1999Difficulty 63 (Academic)
Response in the Living and Non-Living
Bose, Jagadis Chandra
679 Gutenberg downloadsen2006Difficulty 65 (Academic)
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Locy, William A. (William Albert)
678 Gutenberg downloadsen2019Difficulty 56 (Graduate)
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Hall, Winfield Scott
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Life and Letters of Thomas Henry Huxley — Volume 3
Huxley, Thomas Henry
677 Gutenberg downloadsen2004Difficulty 58 (Graduate)
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Broun, A. F. (Alfred Forbes) & Massey, R. E. (Reginald Ernest)
674 Gutenberg downloadsen2025Difficulty 50 (College)
Plants Poisonous to Live Stock
Long, Harold Cecil
674 Gutenberg downloadsen2020Difficulty 60 (Graduate)
Select Specimens of Natural History Collected in Travels to Discover the Source of the Nile. Volume 5.
Bruce, James
674 Gutenberg downloadsen2018Difficulty 64 (Academic)
An essay towards a natural history of serpents
Owen, Charles
673 Gutenberg downloadsen2023Difficulty 49 (College)
Ecological Studies of the Timber Wolf in Northeastern Minnesota
Mech, L. David & Frenzel, Louis Daniel & Karns, P. D. & Ream, Robert R. & Winship, John W.
673 Gutenberg downloadsen2011Difficulty 52 (Graduate)
General Anatomy, Applied to Physiology and Medicine, Vol. 3 (of 3)
Bichat, Xavier
673 Gutenberg downloadsen2018Difficulty 61 (Academic)
A Monograph on the Sub-class Cirripedia (Volume 1 of 2) The Lepadidae; Or, Pedunculated Cirripedes
Darwin, Charles
672 Gutenberg downloadsen2010Difficulty 59 (Graduate)
The case against evolution
O'Toole, George Barry
672 Gutenberg downloadsen2022Difficulty 69 (Academic)
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Gourmont, Remy de
672 Gutenberg downloadsen2014Difficulty 56 (Graduate)
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Wright, Julia McNair
671 Gutenberg downloadsen2023Difficulty 45 (College)
Buffon's Natural History. Volume 08 (of 10) Containing a Theory of the Earth, a General History of Man, of the Brute Creation, and of Vegetables, Minerals, &c. &c
Buffon, Georges Louis Leclerc, comte de
670 Gutenberg downloadsen2014Difficulty 61 (Academic)
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Reese, A. M. (Albert Moore)
670 Gutenberg downloadsen2023Difficulty 53 (Graduate)
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Anonymous
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Asimov, Isaac & Dobzhansky, Theodosius
669 Gutenberg downloadsen2017Difficulty 59 (Graduate)
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Punnett, Reginald Crundall
668 Gutenberg downloadsen2009Difficulty 61 (Academic)
Unconscious Memory
Butler, Samuel
666 Gutenberg downloadsen2004Difficulty 64 (Academic)
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Selous, Edmund
665 Gutenberg downloadsen2023Difficulty 76 (Expert)
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Harper, Francis
664 Gutenberg downloadsen2010Difficulty 59 (Graduate)
Cave Hunting Researches on the evidence of caves respecting the early inhabitants of Europe
Dawkins, William Boyd
660 Gutenberg downloadsen2016Difficulty 77 (Expert)
Wood and Forest
Noyes, William
658 Gutenberg downloadsen2011Difficulty 51 (Graduate)
The Bacillus of Long Life A Manual of the Preparation and Souring of Milk for Dietary Purposes, Together with an Historical Account of the Use of Fermented Milks, from the Earliest Times to the Present Day, and Their Wonderful Effect in the Prolonging of Human Existence
Douglas, Loudon M.
657 Gutenberg downloadsen2010Difficulty 56 (Graduate)
The Nests and Eggs of Indian Birds, Volume 1
Hume, Allan Octavian
656 Gutenberg downloadsen2004Difficulty 49 (College)
The Evolution Theory, Vol. 2 of 2
Weismann, August
655 Gutenberg downloadsen2021Difficulty 64 (Academic)
The Bird Study Book
Pearson, T. Gilbert (Thomas Gilbert)
654 Gutenberg downloadsen2007Difficulty 52 (Graduate)
The Harvest of the Sea A contribution to the natural and economic history of the British food fishes
Bertram, James Glass
653 Gutenberg downloadsen2020Difficulty 66 (Academic)
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651 Gutenberg downloadsen2023Difficulty 66 (Academic)
A Synopsis of the North American Lagomorpha
Hall, E. Raymond (Eugene Raymond)
650 Gutenberg downloadsen2010Difficulty 53 (Graduate)
Ancient Plants Being a Simple Account of the past Vegetation of the Earth and of the Recent Important Discoveries Made in This Realm of Nature
Stopes, Marie Carmichael
650 Gutenberg downloadsen2013Difficulty 57 (Graduate)
Jelly-Fish, Star-Fish, and Sea-Urchins: Being a Research on Primitive Nervous Systems
Romanes, George John
650 Gutenberg downloadsen2014Difficulty 64 (Academic)
Manual of the apiary
Cook, Albert John
650 Gutenberg downloadsen2022Difficulty 49 (College)
Species Plantarum, Sections I-III
Linné, Carl von
650 Gutenberg downloadsla2007
Text Book of Biology, Part 1: Vertebrata
Wells, H. G. (Herbert George)
649 Gutenberg downloadsen2007Difficulty 61 (Academic)
The Geographical Distribution of Animals, Volume 2 With a study of the relations of living and extinct faunas as elucidating the past changes of the Earth's surface
Wallace, Alfred Russel
649 Gutenberg downloadsen2018Difficulty 64 (Academic)
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Warming, Eugenius
648 Gutenberg downloadsen2022Difficulty 55 (Graduate)
The Birds of Australia, Vol. 5 of 7
Gould, John
648 Gutenberg downloadsen2020Difficulty 61 (Academic)
Initiative in Evolution
Kidd, Walter
647 Gutenberg downloadsen2016Difficulty 57 (Graduate)
Natural Wonders
Brewster, Edwin Tenney
646 Gutenberg downloadsen2015Difficulty 40 (High School)
Buffon's Natural History. Volume 06 (of 10) Containing a Theory of the Earth, a General History of Man, of the Brute Creation, and of Vegetables, Minerals, &c. &c
Buffon, Georges Louis Leclerc, comte de
644 Gutenberg downloadsen2014Difficulty 60 (Graduate)
Fossil plants, Vol. 2 : $b A text-book for students of botany and geology
Seward, A. C. (Albert Charles)
644 Gutenberg downloadsen2022Difficulty 63 (Academic)
An Introduction to Entomology: Vol. 1 or Elements of the Natural History of the Insects
Kirby, William & Spence, William
643 Gutenberg downloadsen2013Difficulty 74 (Expert)
Cassell's book of birds; vol. 4
Brehm, Alfred Edmund
643 Gutenberg downloadsen2022Difficulty 58 (Graduate)
Die Naturwissenschaften in ihrer Entwicklung und in ihrem Zusammenhange, IV. Band Das Emporblühen der modernen Naturwissenschaften seit der Entdeckung des Energieprinzips
Dannemann, Friedrich
642 Gutenberg downloadsde2019
Journal of the Proceedings of the Linnean Society - Vol. 3 Zoology
Linnean Society of London
642 Gutenberg downloadsen2007Difficulty 61 (Academic)
The Effects of Cross & Self-Fertilisation in the Vegetable Kingdom
Darwin, Charles
642 Gutenberg downloadsen2003Difficulty 61 (Academic)
Travels on the Amazon
Wallace, Alfred Russel
642 Gutenberg downloadsen2016Difficulty 65 (Academic)
Lachesis Lapponica; Or, A Tour in Lapland, Volume 1
Linné, Carl von
641 Gutenberg downloadsen2010Difficulty 54 (Graduate)
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Gosse, Philip Henry
640 Gutenberg downloadsen2024Difficulty 63 (Academic)
A history of land mammals in the western hemisphere
Scott, William Berryman
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Newman, George, Sir
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Zoological Illustrations, Volume 1 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
637 Gutenberg downloadsen2012Difficulty 64 (Academic)
The Whence and the Whither of Man A Brief History of His Origin and Development through Conformity to Environment; Being the Morse Lectures of 1895
Tyler, John M. (John Mason)
636 Gutenberg downloadsen2005Difficulty 53 (Graduate)
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Huxley, Thomas Henry
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Louis Pasteur: His Life and Labours
Vallery-Radot, René
634 Gutenberg downloadsen2014Difficulty 59 (Graduate)
The Geological History of Plants
Dawson, John William, Sir
634 Gutenberg downloadsen2016Difficulty 55 (Graduate)
Appletons' Popular Science Monthly, December 1899 Vol. LVI, November, 1899 to April, 1900
Various
633 Gutenberg downloadsen2014Difficulty 72 (Expert)
The Illustrated Self-Instructor in Phrenology and Physiology
Fowler, O. S. (Orson Squire) & Fowler, L. N. (Lorenzo Niles)
633 Gutenberg downloadsen2010Difficulty 64 (Academic)
An Introduction to Nature-study
Stenhouse, E. (Ernest)
632 Gutenberg downloadsen2020Difficulty 42 (College)
Our Domestic Birds: Elementary Lessons in Aviculture
Robinson, John H. (John Henry)
632 Gutenberg downloadsen2010Difficulty 61 (Academic)
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Russell, H. L. (Harry Luman) & Hastings, E. G. (Edwin George)
632 Gutenberg downloadsen2010Difficulty 60 (Graduate)
A Manual of Conchology According to the System Laid Down by Lamarck, with the Late Improvements by De Blainville. Exemplified and Arranged for the Use of Students.
Wyatt, Thomas
631 Gutenberg downloadsen2018Difficulty 58 (Graduate)
Animal Parasites and Messmates
Beneden, P. J. van (Pierre Joseph)
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Scientific American, Volume XXXVI., No. 8, February 24, 1877 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures.
Various
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Histology of the Blood, Normal and Pathological
Ehrlich, Paul & Lazarus, Adolf
630 Gutenberg downloadsen2009Difficulty 63 (Academic)
The Toxicity of Caffein: An experimental study on different species of animals
Salant, William & Rieger, J. B. (John Benjamin)
630 Gutenberg downloadsen2014Difficulty 63 (Academic)
Aphorisms and Reflections from the works of T. H. Huxley
Huxley, Thomas Henry
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De Canibus Britannicis: Of Englishe Dogges
Caius, John
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On Molecular and Microscopic Science, Volume 2 (of 2)
Somerville, Mary
628 Gutenberg downloadsen2018Difficulty 58 (Graduate)
Ornithological biography, Vol. 4 (of 5) : $b An account of the habits of the birds of the United States of America
Audubon, John James
627 Gutenberg downloadsen2023Difficulty 62 (Academic)
The book of antelopes, vol. 4 (of 4)
Sclater, Philip Lutley & Thomas, Oldfield
627 Gutenberg downloadsen2023Difficulty 48 (College)
The Recent Mammals of Tamaulipas, México
Alvarez, Ticul
627 Gutenberg downloadsen2012Difficulty 56 (Graduate)
The Variation of Animals and Plants under Domestication — Volume 1
Darwin, Charles
627 Gutenberg downloadsen2001Difficulty 62 (Academic)
Metapsychical Phenomena: Methods and Observations
Maxwell, J. (Joseph)
626 Gutenberg downloadsen2014Difficulty 60 (Graduate)
Text book of veterinary medicine, Volume 3 (of 5)
Law, James
626 Gutenberg downloadsen2023Difficulty 63 (Academic)
Animal Locomotion; or, walking, swimming, and flying With a dissertation on aëronautics
Pettigrew, James Bell
625 Gutenberg downloadsen2018Difficulty 66 (Academic)
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Mendel, Gregor
625 Gutenberg downloadsde2012
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The flowering plants of Africa An analytical key to the genera of African phanerograms
Thonner, Franz
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The Origin of Vertebrates
Gaskell, Walter Holbrook
623 Gutenberg downloadsen2013Difficulty 82 (Specialist)
The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity
Conn, H. W. (Herbert William)
622 Gutenberg downloadsen2005Difficulty 58 (Graduate)
Appletons' Popular Science Monthly, July 1899 Volume LV, No. 3, July 1899
Various
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Animal Life in Field and Garden
Fabre, Jean-Henri
619 Gutenberg downloadsen2021Difficulty 47 (College)
Buffon's Natural History. Volume 07 (of 10) Containing a Theory of the Earth, a General History of Man, of the Brute Creation, and of Vegetables, Minerals, &c. &c
Buffon, Georges Louis Leclerc, comte de
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Drawings and Pharmacy in Al-Zahrawi's 10th-Century Surgical Treatise
Hamarneh, Sami Khalaf
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Disease and Its Causes
Councilman, W. T. (William Thomas)
618 Gutenberg downloadsen2005Difficulty 57 (Graduate)
Food Poisoning
Jordan, Edwin O. (Edwin Oakes)
618 Gutenberg downloadsen2010Difficulty 65 (Academic)
The Organism as a Whole, from a Physicochemical Viewpoint
Loeb, Jacques
618 Gutenberg downloadsen2014Difficulty 68 (Academic)
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Driesch, Hans
618 Gutenberg downloadsen2013Difficulty 67 (Academic)
Our Common Insects A Popular Account of the Insects of Our Fields, Forests, Gardens and Houses
Packard, A. S. (Alpheus Spring)
617 Gutenberg downloadsen2008Difficulty 53 (Graduate)
The Pecan and its Culture
Hume, H. Harold (Hardrada Harold)
616 Gutenberg downloadsen2009Difficulty 57 (Graduate)
The Last Link: Our Present Knowledge of the Descent of Man
Haeckel, Ernst
615 Gutenberg downloadsen2013Difficulty 63 (Academic)
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613 Gutenberg downloadsen2024Difficulty 63 (Academic)
Mental Evolution in Man: Origin of Human Faculty
Romanes, George John
611 Gutenberg downloadsen2015Difficulty 68 (Academic)
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Johnston, Richard F.
611 Gutenberg downloadsen2011Difficulty 74 (Expert)
An introduction to the study of fishes
Günther, Albert C. L. G. (Albert Carl Ludwig Gotthilf)
610 Gutenberg downloadsen2023Difficulty 74 (Expert)
The Avifauna of Micronesia, Its Origin, Evolution, and Distribution
Baker, Rollin H. (Rollin Harold)
610 Gutenberg downloadsen2013Difficulty 61 (Academic)
The giant sequoia : $b An account of the history and characteristics of the big trees of California
Ellsworth, Rodney Sydes
610 Gutenberg downloadsen2025Difficulty 56 (Graduate)
Buffon's Natural History. Volume 09 (of 10) Containing a Theory of the Earth, a General History of Man, of the Brute Creation, and of Vegetables, Minerals, &c. &c
Buffon, Georges Louis Leclerc, comte de
608 Gutenberg downloadsen2014Difficulty 54 (Graduate)
Catalogue of Economic Plants in the Collection of the U. S. Department of Agriculture
Saunders, William
608 Gutenberg downloadsen2008Difficulty 52 (Graduate)
The Origin of Species From 'The Westminster Review', April 1860
Huxley, Thomas Henry
608 Gutenberg downloadsen2001Difficulty 74 (Expert)
Grasses : $b A handbook for use in the field and laboratory
Ward, H. Marshall (Harry Marshall)
607 Gutenberg downloadsen2015Difficulty 56 (Graduate)
Poisonous Dwellers of the Desert
Dodge, Natt N. (Natt Noyes)
607 Gutenberg downloadsen2017Difficulty 61 (Academic)
Text book of veterinary medicine, Volume 1 (of 5)
Law, James
607 Gutenberg downloadsen2023Difficulty 67 (Academic)
The apiary; or, bees, bee-hives, and bee culture [1866] Being a familiar account of the habits of bees, and the most improved methods of management, with full directions, adapted for the cottager, farmer, or scientific apiarian
Neighbor, Alfred
607 Gutenberg downloadsen2022Difficulty 59 (Graduate)
Uit de dierenwereld van het water Schetsen in woord en beeld van het lever der lagere diersoorten
Snijders, A. J. C. (Anthony J. C.)
607 Gutenberg downloadsnl2022
On the Relations of Man to the Lower Animals
Huxley, Thomas Henry
606 Gutenberg downloadsen2001Difficulty 72 (Expert)
The Appendages, Anatomy, and Relationships of Trilobites
Raymond, Percy E. (Percy Edward)
605 Gutenberg downloadsen2012Difficulty 67 (Academic)
The Dolphin in History
Montagu, Ashley & Lilly, John Cunningham
605 Gutenberg downloadsen2019Difficulty 56 (Graduate)
Lameness of the Horse Veterinary Practitioners' Series, No. 1
Lacroix, John Victor
604 Gutenberg downloadsen2005Difficulty 65 (Academic)
Life Movements in Plants, Volume II
Bose, Jagadis Chandra
604 Gutenberg downloadsen2012Difficulty 73 (Expert)
Animals of the Past
Lucas, Frederic A. (Frederic Augustus)
603 Gutenberg downloadsen2011Difficulty 60 (Graduate)
Flowers of the Southwest Deserts
Dodge, Natt N. (Natt Noyes)
601 Gutenberg downloadsen2016Difficulty 61 (Academic)
Inorganic Plant Poisons and Stimulants
Brenchley, Winifred Elsie
601 Gutenberg downloadsen2015Difficulty 61 (Academic)
Trees: A Woodland Notebook Containing Observations on Certain British and Exotic Trees
Maxwell, Herbert, Sir
600 Gutenberg downloadsen2012Difficulty 59 (Graduate)
An Introduction to Entomology: Vol. 2 or Elements of the Natural History of the Insects
Kirby, William & Spence, William
599 Gutenberg downloadsen2013Difficulty 61 (Academic)
Glaucus; Or, The Wonders of the Shore
Kingsley, Charles
597 Gutenberg downloadsen1996Difficulty 57 (Graduate)
The Botanical Magazine, Vol. 01 Or, Flower-Garden Displayed
Curtis, William
597 Gutenberg downloadsen2005Difficulty 57 (Graduate)
Journal of a tour in Marocco and the Great Atlas
Hooker, Joseph Dalton & Ball, John
596 Gutenberg downloadsen2023Difficulty 66 (Academic)
The Life of an Insect being a history of the changes of insects from the egg to the perfect being.
Unknown
596 Gutenberg downloadsen2014Difficulty 62 (Academic)
Being Well-Born: An Introduction to Eugenics
Guyer, Michael F. (Michael Frederic)
595 Gutenberg downloadsen2012Difficulty 85 (Specialist)
Cassell's book of birds; vol. 3
Brehm, Alfred Edmund
594 Gutenberg downloadsen2019Difficulty 62 (Academic)
Life and death
Dastre, A. (Albert)
591 Gutenberg downloadsen2021Difficulty 56 (Graduate)
Charles Darwin
Allen, Grant
590 Gutenberg downloadsen2010Difficulty 73 (Expert)
Dr. B. Mure's materia medica : $b or, provings of the principal animal and vegetable poisons of the Brazilian Empire, and their application in the treatment of disease
Mure, Benoît
590 Gutenberg downloadsen2023Difficulty 45 (College)
Freshwater Sponges, Hydroids & Polyzoa
Annandale, Nelson
589 Gutenberg downloadsen2011Difficulty 61 (Academic)
History of Embalming and of Preparations in Anatomy, Pathology, and Natural History; Including an Account of a New Process for Embalming
Gannal, J.-N. (Jean-Nicolas)
588 Gutenberg downloadsen2015Difficulty 78 (Expert)
Nests and Eggs of Birds of the United States Illustrated
Gentry, Thomas G. (Thomas George)
588 Gutenberg downloadsen2014Difficulty 60 (Graduate)
Woman and Womanhood: A Search for Principles
Saleeby, C. W. (Caleb Williams)
588 Gutenberg downloadsen2006Difficulty 59 (Graduate)
Illustrations of the Birds of California, Texas, Oregon, British and Russian America
Cassin, John
587 Gutenberg downloadsen2021Difficulty 63 (Academic)
Dragons of the Air: An Account of Extinct Flying Reptiles
Seeley, H. G. (Harry Govier)
586 Gutenberg downloadsen2011Difficulty 54 (Graduate)
Luck, or Cunning, as the Main Means of Organic Modification
Butler, Samuel
586 Gutenberg downloadsen2004Difficulty 61 (Academic)
The octopus : $b or, The "devil-fish" of fiction and of fact
Lee, Henry
586 Gutenberg downloadsen2023Difficulty 61 (Academic)
The apiary; or, bees, bee-hives, and bee culture [1878] being a familiar account of the habits of bees, and the most improved methods of management
Neighbor, Alfred
585 Gutenberg downloadsen2022Difficulty 53 (Graduate)
Birds, Illustrated by Color Photography, Vol. 1, No. 6 June, 1897
Various
584 Gutenberg downloadsen2009Difficulty 48 (College)
Aspects of Reproduction and Development in the Prairie Vole (Microtus ochrogaster)
Fitch, Henry S. (Henry Sheldon)
583 Gutenberg downloadsen2011Difficulty 60 (Graduate)
The Flea
Russell, Harold
583 Gutenberg downloadsen2014Difficulty 53 (Graduate)
Physics and Politics, or, Thoughts on the application of the principles of "natural selection" and "inheritance" to political society
Bagehot, Walter
582 Gutenberg downloadsen2003Difficulty 64 (Academic)
The Chain of Life in Geological Time A Sketch of the Origin and Succession of Animals and Plants
Dawson, John William, Sir
582 Gutenberg downloadsen2011Difficulty 56 (Graduate)
Buffon's Natural History, Volume 03 (of 10) Containing a Theory of the Earth, a General History of Man, of the Brute Creation, and of Vegetables, Minerals, &c. &c.
Buffon, Georges Louis Leclerc, comte de
581 Gutenberg downloadsen2014Difficulty 68 (Academic)
The Honey-Bee: Its Natural History, Physiology and Management
Bevan, Edward
581 Gutenberg downloadsen2022Difficulty 63 (Academic)
The Lights of the Church and the Light of Science Essay #6 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
581 Gutenberg downloadsen2001Difficulty 70 (Academic)
Canterbury Pieces
Butler, Samuel
579 Gutenberg downloadsen2002Difficulty 55 (Graduate)
Darwiniana; Essays and Reviews Pertaining to Darwinism
Gray, Asa
579 Gutenberg downloadsen2004Difficulty 69 (Academic)
History of biology
Miall, L. C. (Louis Compton)
579 Gutenberg downloadsen2018Difficulty 61 (Academic)
Physiological economy in nutrition, with special reference to the minimal proteid requirement of the healthy man an experimental study
Chittenden, R. H. (Russell Henry)
579 Gutenberg downloadsen2022Difficulty 66 (Academic)
The Botanical Magazine, Vol. 08 Or, Flower-Garden Displayed
Curtis, William
579 Gutenberg downloadsen2008Difficulty 60 (Graduate)
Time and Change
Burroughs, John
578 Gutenberg downloadsen2004Difficulty 54 (Graduate)
A Historical Account of Useful Inventions and Scientific Discoveries Being a manual of instruction and entertainment.
Grant, George
577 Gutenberg downloadsen2016Difficulty 62 (Academic)
Les abeilles
Pérez, Jean M.
577 Gutenberg downloadsfr2011
Quadrupeds, What They Are and Where Found: A Book of Zoology for Boys
Reid, Mayne
577 Gutenberg downloadsen2007Difficulty 55 (Graduate)
A Hand-book to the Primates, Volume 1 (of 2)
Forbes, Henry O. (Henry Ogg)
576 Gutenberg downloadsen2013Difficulty 56 (Graduate)
The romance of the microscope : $b an interesting description of its uses in all branches of science, industry, agriculture, and in the detection of crime, with a short account of its origin, history, and development
Ealand, C. A. (Charles Aubrey)
576 Gutenberg downloadsen2015Difficulty 55 (Graduate)
The Story of Milk
Frederiksen, Johan Ditlev
576 Gutenberg downloadsen2021Difficulty 64 (Academic)
Genera and Subgenera of Chipmunks
White, John A.
575 Gutenberg downloadsen2009Difficulty 61 (Academic)
Insects and Diseases of Trees in the South
Anonymous
575 Gutenberg downloadsen2015Difficulty 55 (Graduate)
Radioisotopes and Life Processes (Revised)
Kisieleski, Walter E. & Baserga, Renato
575 Gutenberg downloadsen2015Difficulty 66 (Academic)
Birds in Flight
Pycraft, W. P. (William Plane)
574 Gutenberg downloadsen2014Difficulty 54 (Graduate)
Experiments on Animals
Paget, Stephen
574 Gutenberg downloadsen2013Difficulty 59 (Graduate)
Mammals of Northwestern South Dakota
Andersen, Kenneth W. & Jones, J. Knox
573 Gutenberg downloadsen2010Difficulty 50 (College)
Book of monsters : $b Portraits and biographies of a few of the inhabitants of woodland and meadow
Fairchild, David & Fairchild, Marian
572 Gutenberg downloadsen2012Difficulty 55 (Graduate)
Buffon's Natural History. Volume 04 (of 10) Containing a Theory of the Earth, a General History of Man, of the Brute Creation, and of Vegetables, Minerals, &c. &c
Buffon, Georges Louis Leclerc, comte de
572 Gutenberg downloadsen2014Difficulty 56 (Graduate)
Lives of Eminent Zoologists, from Aristotle to Linnæus with Introductory remarks on the Study of Natural History
MacGillivray, William
572 Gutenberg downloadsen2010Difficulty 84 (Specialist)
The Courtship of Animals
Pycraft, W. P. (William Plane)
572 Gutenberg downloadsen2019Difficulty 66 (Academic)
Alfred Russel Wallace: Letters and Reminiscences, Vol. 2
Wallace, Alfred Russel & Marchant, James, Sir
570 Gutenberg downloadsen2005Difficulty 69 (Academic)
Essays Upon Some Controverted Questions
Huxley, Thomas Henry
570 Gutenberg downloadsen2010Difficulty 78 (Expert)
Man's Place in the Universe A Study of the Results of Scientific Research in Relation to the Unity or Plurality of Worlds, 3rd Edition
Wallace, Alfred Russel
570 Gutenberg downloadsen2012Difficulty 71 (Expert)
The Naturalist in Nicaragua
Belt, Thomas
570 Gutenberg downloadsen2004Difficulty 63 (Academic)
The Botanist's Companion, Volume II Or an Introduction to the Knowledge of Practical Botany, and the Uses of Plants. Either Growing Wild in Great Britain, or Cultivated for the Puroses of Agriculture, Medicine, Rural Oeconomy, or the Arts
Salisbury, William
569 Gutenberg downloadsen2004Difficulty 55 (Graduate)
The physiology of digestion considered with relation to the principles of dietetics
Combe, Andrew
569 Gutenberg downloadsen2023Difficulty 83 (Specialist)
Het Leven der Dieren: Deel 2, Hoofdstuk 02: De Papegaaien; Hoofdstuk 03: De Duifvogels
Brehm, Alfred Edmund
567 Gutenberg downloadsnl2009
Carpet Beetles and Their Control
Back, E. A. (Ernest Adna)
566 Gutenberg downloadsen2019Difficulty 55 (Graduate)
Mimicry in Butterflies
Punnett, Reginald Crundall
565 Gutenberg downloadsen2013Difficulty 62 (Academic)
North American Jumping Mice (Genus Zapus)
Krutzsch, Philip H. (Philip Henry)
565 Gutenberg downloadsen2012Difficulty 64 (Academic)
Physiology
Foster, M. (Michael), Sir
565 Gutenberg downloadsen2016Difficulty 39 (High School)
Appletons' Popular Science Monthly, April 1899 Volume LIV, No. 6, April 1899
Various
564 Gutenberg downloadsen2013Difficulty 56 (Graduate)
Living lights : $b A popular account of phosphorescent animals and vegetables
Holder, Charles Frederick
563 Gutenberg downloadsen2025Difficulty 58 (Graduate)
More Beetles
Fabre, Jean-Henri
562 Gutenberg downloadsen2022Difficulty 47 (College)
Philosophical transactions, Vol. L. Part II. For the year 1758. Giving some account of the present undertakings, studies, and labours, of the ingenious, in many considerable parts of the world.
Various & Royal Society (Great Britain)
561 Gutenberg downloadsen2022Difficulty 49 (College)
The Hunting Wasps
Fabre, Jean-Henri
561 Gutenberg downloadsen2022Difficulty 57 (Graduate)
Directions for Collecting and Preserving Insects
Riley, Charles V. (Charles Valentine)
560 Gutenberg downloadsen2012Difficulty 70 (Academic)
Garden Pests in New Zealand A Popular Manual for Practical Gardeners, Farmers and Schools
Miller, David
560 Gutenberg downloadsen2014Difficulty 71 (Expert)
A Description of the Bar-and-Frame-Hive With an Abstract of Wildman's Complete Guide for the Management of Bees Throughout the Year
Munn, William Augustus
559 Gutenberg downloadsen2006Difficulty 57 (Graduate)
Fossil Butterflies Memoirs of the American Association for the Advancement of Science, I.
Scudder, Samuel Hubbard
559 Gutenberg downloadsen2017Difficulty 59 (Graduate)
Rudiments of Conchology Intended as a familiar introduction to the science.
Venning, Mary Anne
559 Gutenberg downloadsen2015Difficulty 49 (College)
Die Tier- und Pflanzenwelt des Süsswassers. Zweiter Band.
Apstein, C. (Carl Heinrich) & Borcherding, Friedrich & Clessin, Stephan & Kramer, Paul & Schmidt-Schwedt, E. & Seligo, Arthur & Zschokke, Friedrich
558 Gutenberg downloadsde2024
Disease in plants
Ward, H. Marshall (Harry Marshall)
558 Gutenberg downloadsen2012Difficulty 66 (Academic)
Whale hunting with gun and camera A naturalist's account of the modern shore-whaling industry, of whales and their habits, and of hunting experiences in various parts of the world
Andrews, Roy Chapman
558 Gutenberg downloadsen2022Difficulty 87 (Specialist)
Aspects of nature, in different lands and different climates (Vol. 2 of 2) with scientific elucidations
Humboldt, Alexander von
557 Gutenberg downloadsen2022Difficulty 72 (Expert)
Hints towards the formation of a more comprehensive theory of life.
Coleridge, Samuel Taylor
557 Gutenberg downloadsen2008Difficulty 68 (Academic)
The Meaning of Evolution
Schmucker, Samuel Christian
557 Gutenberg downloadsen2009Difficulty 51 (Graduate)
A Hand-book to the Primates, Volume 2 (of 2)
Forbes, Henry O. (Henry Ogg)
556 Gutenberg downloadsen2013Difficulty 54 (Graduate)
Desert and water gardens of the Red Sea : $b Being an account of the natives and the shore formations of the coast
Crossland, Cyril
556 Gutenberg downloadsen2023Difficulty 50 (College)
Myology and Serology of the Avian Family Fringillidae: A Taxonomic Study
Stallcup, William B.
556 Gutenberg downloadsen2010Difficulty 65 (Academic)
Recuerdos de mi vida (tomo 2 de 2)
Ramón y Cajal, Santiago
556 Gutenberg downloadses2019
An Elementary Text-book of the Microscope including a description of the methods of preparing and mounting objects, etc.
Griffith, J. W. (John William)
555 Gutenberg downloadsen2015Difficulty 52 (Graduate)
The Popular Science Monthly, September, 1900 Vol. 57, May, 1900 to October, 1900
Various
555 Gutenberg downloadsen2014Difficulty 77 (Expert)
Harvey's Views on the Use of the Circulation of the Blood
Curtis, John Green
554 Gutenberg downloadsen2014Difficulty 69 (Academic)
The Botanical Magazine, Vol. 07 Or, Flower-Garden Displayed
Curtis, William
554 Gutenberg downloadsen2007Difficulty 58 (Graduate)
André Michaux's Travels into Kentucky, 1793-96; François André Michaux's Travels West of Alleghany Mountains, 1802; Thaddeus Mason Harris's Journal of a Tour Northwest of Alleghany Mountains, 1803.
Michaux, André & Harris, Thaddeus Mason & Michaux, François André
553 Gutenberg downloadsen2025Difficulty 65 (Academic)
Den Hunting as a Means of Coyote Control
Young, Stanley Paul & Dobyns, Harold Warren
553 Gutenberg downloadsen2015Difficulty 49 (College)
The Foot-prints of the Creator : $b or, The Asterolepis of Stromness
Miller, Hugh
553 Gutenberg downloadsen2022Difficulty 66 (Academic)
Buffon's Natural History. Volume 05 (of 10) Containing a Theory of the Earth, a General History of Man, of the Brute Creation, and of Vegetables, Minerals, &c. &c
Buffon, Georges Louis Leclerc, comte de
552 Gutenberg downloadsen2014Difficulty 65 (Academic)
Food of the Crow, Corvus brachyrhynchos Brehm, in South-central Kansas
Platt, Dwight R.
552 Gutenberg downloadsen2010Difficulty 53 (Graduate)
Scientific American Supplement, No. 799, April 25, 1891
Various
552 Gutenberg downloadsen2004Difficulty 50 (College)
Animal Castration
Liautard, Alexandre François Augustin
550 Gutenberg downloadsen2019Difficulty 71 (Expert)
Common Diseases of Farm Animals
Craig, Robert Alexander
550 Gutenberg downloadsen2005Difficulty 55 (Graduate)
Life History of the Kangaroo Rat
Vorhies, Charles Taylor & Taylor, Walter P. (Walter Penn)
550 Gutenberg downloadsen2006Difficulty 62 (Academic)
Stories of the Universe: Animal Life
Lindsay, B.
550 Gutenberg downloadsen2012Difficulty 51 (Graduate)
Noteworthy families (modern science) : $b An index to kinships in near degrees between persons whose achievements are honourable, and have been publicly recorded
Galton, Francis & Schuster, Edgar
549 Gutenberg downloadsen2005Difficulty 64 (Academic)
Popular Books on Natural Science For Practical Use in Every Household, for Readers of All Classes
Bernstein, Aaron David
549 Gutenberg downloadsen2011Difficulty 50 (College)
The Farmer's Veterinarian: A Practical Treatise on the Diseases of Farm Stock
Burkett, Charles William
549 Gutenberg downloadsen2017Difficulty 49 (College)
Birds from North Borneo University of Kansas Publications, Museum of Natural History, Volume 17, No. 8, pp. 377-433, October 27, 1966
Thompson, Max C.
548 Gutenberg downloadsen2010Difficulty 56 (Graduate)
Fishes of the Big Blue River Basin, Kansas
Minckley, W. L.
548 Gutenberg downloadsen2011Difficulty 47 (College)
Journal of the Proceedings of the Linnean Society - Vol. 4 Zoology
Linnean Society of London
548 Gutenberg downloadsen2014Difficulty 61 (Academic)
Louis Agassiz: His Life and Correspondence
Agassiz, Louis
548 Gutenberg downloadsen2004Difficulty 49 (College)
Personality of plants
Dixon, Royal & Fitch, Franklyn Everett
548 Gutenberg downloadsen2022Difficulty 54 (Graduate)
The history of a mouthful of bread : $b and its effect on the organization of men and animals
Macé, Jean
548 Gutenberg downloadsen2004Difficulty 49 (College)
The Taleef Shereef; Or, Indian Materia Medica
Unknown
548 Gutenberg downloadsen2016Difficulty 54 (Graduate)
Mammals of the San Gabriel Mountains of California
Vaughan, Terry A.
547 Gutenberg downloadsen2011Difficulty 63 (Academic)
Pecan Diseases and Pests and Their Control
Rosburg, David W. & King, D. R.
546 Gutenberg downloadsen2021Difficulty 64 (Academic)
Buffon's Natural History. Volume 10 (of 10) Containing a Theory of the Earth, a General History of Man, of the Brute Creation, and of Vegetables, Minerals, &c. &c
Buffon, Georges Louis Leclerc, comte de
545 Gutenberg downloadsen2014Difficulty 61 (Academic)
Ideen zu einer Physiognomik der Gewächse
Humboldt, Alexander von
545 Gutenberg downloadsde2007
Wayside and woodland trees : $b a pocket guide to the British sylva
Step, Edward
545 Gutenberg downloadsen2010Difficulty 53 (Graduate)
Little Masterpieces of Science: The Naturalist as Interpreter and Seer
Unknown
544 Gutenberg downloadsen2009Difficulty 63 (Academic)
The Biological Problem of To-day: Preformation Or Epigenesis? The Basis of a Theory of Organic Development
Hertwig, Oscar
543 Gutenberg downloadsen2011Difficulty 67 (Academic)
The Lives of Celebrated Travellers, Vol. 2 (of 3)
St. John, James Augustus
543 Gutenberg downloadsen2021Difficulty 90 (Specialist)
Le monde de la mer
Moquin-Tandon, Alfred
542 Gutenberg downloadsfr2023
Science and Morals and Other Essays
Windle, Bertram Coghill Alan, Sir
542 Gutenberg downloadsen2008Difficulty 56 (Graduate)
Science in Arcady
Allen, Grant
542 Gutenberg downloadsen2005Difficulty 63 (Academic)
The Dancing Mouse: A Study in Animal Behavior
Yerkes, Robert Mearns
542 Gutenberg downloadsen2005Difficulty 64 (Academic)
Creierul, O Enigma Descifrata
Moisa, Dorin Teodor
541 Gutenberg downloadsro2004
The Tropical World Aspects of man and nature in the equatorial regions of the globe.
Hartwig, G. (Georg)
541 Gutenberg downloadsen2020Difficulty 95 (Quantum Electrodynamics)
A Treatise on the Plague and Yellow Fever With an Appendix, containing histories of the plague at Athens in the time of the Peloponnesian War; at Constantinople in the time of Justinian; at London in 1665; at Marseilles in 1720
Tytler, James
540 Gutenberg downloadsen2022Difficulty 55 (Graduate)
Introduction à l'étude de la médecine expérimentale
Bernard, Claude
540 Gutenberg downloadsfr2005
The honey-bee: its nature, homes and products
Harris, William Hetherington
540 Gutenberg downloadsen2022Difficulty 56 (Graduate)
A Taxonomic Study of the Middle American Snake, Pituophis deppei
Duellman, William Edward
539 Gutenberg downloadsen2010Difficulty 58 (Graduate)
Aspects of plant life; with special reference to the British flora
Praeger, R. Lloyd (Robert Lloyd)
539 Gutenberg downloadsen2018Difficulty 59 (Graduate)
Marvels of Pond-life Or, A Year's Microscopic Recreations Among the Polyps, Infusoria, Rotifers, Water-bears and Polyzoa
Slack, Henry James
539 Gutenberg downloadsen2011Difficulty 74 (Expert)
Beginners' botany
Bailey, L. H. (Liberty Hyde)
538 Gutenberg downloadsen2024Difficulty 50 (College)
The Conchologist's First Book A System of Testaceous Malacology, Arranged Expressly for the Use of Schools, in Which the Animals, According to Cuvier, Are Given With the Shells, a Great Number of New Species Added, and the Whole Brought Up, as Accurately as Possible, to the Present Condition of the Science.
Poe, Edgar Allan & Brown, Thomas
538 Gutenberg downloadsen2021Difficulty 53 (Graduate)
Dissection of the Platana and the Frog
Gilchrist, J. D. F. (John Dow Fisher) & Bonde, Cecil von
537 Gutenberg downloadsen2015Difficulty 51 (Graduate)
Parallel Paths: A Study in Biology, Ethics, and Art
Rolleston, T. W. (Thomas William)
537 Gutenberg downloadsen2014Difficulty 69 (Academic)
Appletons' Popular Science Monthly, March 1899 Volume LIV, No. 5, March 1899
Various
536 Gutenberg downloadsen2013Difficulty 57 (Graduate)
A Critique of the Theory of Evolution
Morgan, Thomas Hunt
535 Gutenberg downloadsen2009Difficulty 57 (Graduate)
Regeneration
Morgan, Thomas Hunt
534 Gutenberg downloadsen2018Difficulty 57 (Graduate)
Scientific American Supplement, No. 520, December 19, 1885
Various
534 Gutenberg downloadsen2004Difficulty 56 (Graduate)
Vertebrates from the Barrier Island of Tamaulipas, México
Selander, Robert K. & Johnston, Richard F. & Raun, Gerald G. & Wilks, B. J.
534 Gutenberg downloadsen2011Difficulty 54 (Graduate)
All about Ferrets and Rats A Complete History of Ferrets, Rats, and Rat Extermination from Personal Experiences and Study. Also a Practical Hand-Book on the Ferret.
Isaacsen, Adolph
533 Gutenberg downloadsen2013Difficulty 48 (College)
Scientific American Supplement, No. 561, October 2, 1886
Various
533 Gutenberg downloadsen2005Difficulty 50 (College)
The Mental Life of Monkeys and Apes: A Study of Ideational Behavior
Yerkes, Robert Mearns
533 Gutenberg downloadsen2004Difficulty 61 (Academic)
A Guide for the Study of Animals
Whitney, Worrallo & Lucas, Frederic Colby & Shinn, Harold Brough & Smallwood, Mabel Elizabeth
532 Gutenberg downloadsen2011Difficulty 48 (College)
A Report upon the Mollusk Fisheries of Massachusetts
Massachusetts. Commissioners on Fisheries and Game & Belding, David Lawrence
532 Gutenberg downloadsen2015Difficulty 67 (Academic)
Scientific American Supplement, No. 711, August 17, 1889
Various
532 Gutenberg downloadsen2005Difficulty 61 (Academic)
The Industries of Animals
Houssay, Frédéric
532 Gutenberg downloadsen2009Difficulty 64 (Academic)
The Lobster Fishery of Maine Bulletin of the United States Fish Commission, Vol. 19, Pages 241-265, 1899
Cobb, John N. (John Nathan)
532 Gutenberg downloadsen2006Difficulty 51 (Graduate)
The works of Francis Maitland Balfour, Volume 4 (of 4) : $b Plates
Balfour, Francis M. (Francis Maitland)
532 Gutenberg downloadsen2014Difficulty 50 (College)
On Snake-Poison: Its Action and Its Antidote
Mueller, A.
531 Gutenberg downloadsen2010Difficulty 69 (Academic)
Outlines of Lessons in Botany, Part I; from Seed to Leaf For the Use of Teachers, or Mothers Studying with Their Children
Moore, Jane Newell
531 Gutenberg downloadsen2004Difficulty 42 (College)
Evolution and Classification of the Pocket Gophers of the Subfamily Geomyinae
Russell, Robert J.
530 Gutenberg downloadsen2012Difficulty 65 (Academic)
The Edinburgh New Philosophical Journal, Vol. XLIX April-October 1850
Various
530 Gutenberg downloadsen2013Difficulty 66 (Academic)
Wasps, Social and Solitary
Peckham, George W. (George Williams) & Peckham, E. G. (Elizabeth Gifford)
530 Gutenberg downloadsen2014Difficulty 60 (Graduate)
Appletons' Popular Science Monthly, February 1899 Volume LIV, No. 4, February 1899
Various
529 Gutenberg downloadsen2013Difficulty 57 (Graduate)
A Profitable Instruction of the Perfite Ordering of Bees With the Maruellous Nature, Propertie, and Gouernemente of Them: and the Necessarie Vses Both of Their Honie and Waxe, Seruing Diuersly, as Well in Inward as Outward Causes: Gathered Out of the Best Writers
Hill, Thomas
528 Gutenberg downloadsen2014Difficulty 50 (College)
Little Busybodies: The Life of Crickets, Ants, Bees, Beetles, and Other Busybodies
Marks, Jeannette Augustus & Moody, Julia
528 Gutenberg downloadsen2007Difficulty 34 (High School)
Phrenological Development of Robert Burns From a Cast of His Skull Moulded at Dumfries, the 31st Day of March 1834
Combe, George
528 Gutenberg downloadsen2009Difficulty 58 (Graduate)
Seaside Studies in Natural History. Marine Animals of Massachusetts Bay. Radiates.
Agassiz, Elizabeth Cabot Cary & Agassiz, Alexander
528 Gutenberg downloadsen2011Difficulty 52 (Graduate)
The Chautauquan, Vol. 05, April 1885
Chautauqua Literary and Scientific Circle & Chautauqua Institution
528 Gutenberg downloadsen2017Difficulty 54 (Graduate)
The Hand Phrenologically Considered Being a Glimpse at the Relation of the Mind with the Organisation of the Body
Anonymous
528 Gutenberg downloadsen2016Difficulty 70 (Academic)
Essays in eugenics
Galton, Francis
527 Gutenberg downloadsen2024Difficulty 59 (Graduate)
Some Reptiles and Amphibians from Korea
Webb, Robert G. (Robert Gravem) & Byers, George William & Jones, J. Knox
527 Gutenberg downloadsen2011Difficulty 57 (Graduate)
The romance of the animal world : $b Interesting descriptions of the strange & curious in natural history
Selous, Edmund
527 Gutenberg downloadsen2023Difficulty 63 (Academic)
An ethical problem; or, Sidelights upon scientific experimentation on man and animals
Leffingwell, Albert
526 Gutenberg downloadsen2006Difficulty 64 (Academic)
Natural Philosophy
Ostwald, Wilhelm
526 Gutenberg downloadsen2013Difficulty 60 (Graduate)
The Botanical Magazine, Vol. 03 Or, Flower-Garden Displayed
Curtis, William
526 Gutenberg downloadsen2006Difficulty 57 (Graduate)
Venomous arthropod handbook : $b envenomization symptoms/treatment, identification, biology and control
Biery, Terry L.
526 Gutenberg downloadsen2018Difficulty 66 (Academic)
Charles Darwin and the Theory of Natural Selection
Poulton, Edward Bagnall, Sir
525 Gutenberg downloadsen2021Difficulty 60 (Graduate)
Scientific American Supplement, No. 643, April 28, 1888
Various
525 Gutenberg downloadsen2005Difficulty 65 (Academic)
British Museum (Natural History) General Guide
British Museum (Natural History)
524 Gutenberg downloadsen2018Difficulty 69 (Academic)
Haeckel : $b his life and work
Bölsche, Wilhelm
524 Gutenberg downloadsen2023Difficulty 53 (Graduate)
Les énigmes de l'Univers
Haeckel, Ernst
523 Gutenberg downloadsfr2012
Gorillas & Chimpanzees
Garner, R. L. (Richard Lynch)
522 Gutenberg downloadsen2013Difficulty 51 (Graduate)
Harvesting Ants and Trap-Door Spiders Notes and Observations on Their Habits and Dwellings
Moggridge, John Traherne
522 Gutenberg downloadsen2021Difficulty 54 (Graduate)
Physiological Researches on Life and Death
Bichat, Xavier
521 Gutenberg downloadsen2018Difficulty 60 (Graduate)
The Life of the Scorpion
Fabre, Jean-Henri
521 Gutenberg downloadsen2021Difficulty 49 (College)
Buffon's Natural History, Volume 01 (of 10) Containing a Theory of the Earth, a General History of Man, of the Brute Creation, and of Vegetables, Mineral, &c. &c
Buffon, Georges Louis Leclerc, comte de
520 Gutenberg downloadsen2014Difficulty 76 (Expert)
Scientific American Supplement, No. 598, June 18, 1887
Various
520 Gutenberg downloadsen2004Difficulty 50 (College)
The Fishing Industry
Gibbs, William E. (William Edward)
520 Gutenberg downloadsen2016Difficulty 54 (Graduate)
The Insect
Michelet, Jules
520 Gutenberg downloadsen2013Difficulty 61 (Academic)
Birds from Coahuila, Mexico
Urban, Emil K.
518 Gutenberg downloadsen2008Difficulty 55 (Graduate)
Mendel's principles of heredity: A defence
Bateson, William & Mendel, Gregor
518 Gutenberg downloadsen2022Difficulty 55 (Graduate)
Amphibians and Reptiles of the Rainforests of Southern El Petén, Guatemala
Duellman, William Edward
517 Gutenberg downloadsen2011Difficulty 64 (Academic)
Fishes of Chautauqua, Cowley and Elk Counties, Kansas
Metcalf, Artie L.
517 Gutenberg downloadsen2010Difficulty 55 (Graduate)
Het Leven der Dieren. Deel 3. Afdeling 2. De Visschen
Brehm, Alfred Edmund
517 Gutenberg downloadsnl2016
British Butterflies: Figures and Descriptions of Every Native Species
Coleman, W. S. (William Stephen)
516 Gutenberg downloadsen2010Difficulty 65 (Academic)
Little Wanderers
Morley, Margaret Warner
516 Gutenberg downloadsen2020Difficulty 41 (College)
Systematics of Megachiropteran Bats in the Solomon Islands
Phillips, Carleton J.
516 Gutenberg downloadsen2012Difficulty 58 (Graduate)
Evolution: Its nature, its evidence, and its relation to religious thought
LeConte, Joseph
515 Gutenberg downloadsen2014Difficulty 88 (Specialist)
The botanist's repository for new and rare plants; vol. 03 & 04 [of 10]
Andrews, Henry Cranke, active 1799-1828
515 Gutenberg downloadsen2024Difficulty 55 (Graduate)
Colouration in Animals and Plants
Tylor, Alfred
514 Gutenberg downloadsen2014Difficulty 56 (Graduate)
Occurrence of the Garter Snake, Thamnophis sirtalis, in the Great Plains and Rocky Mountains
Fitch, Henry S. (Henry Sheldon) & Maslin, T. Paul
514 Gutenberg downloadsen2010Difficulty 66 (Academic)
Pearls & Parasites
Shipley, A. E. (Arthur Everett), Sir
514 Gutenberg downloadsen2016Difficulty 55 (Graduate)
The Botanical Magazine, Vol. 05 Or, Flower-Garden Displayed
Curtis, William
514 Gutenberg downloadsen2006Difficulty 57 (Graduate)
The Popular Science Monthly, October, 1900 Vol. 57, May, 1900 to October, 1900
Various
514 Gutenberg downloadsen2014Difficulty 75 (Expert)
The zoology of the voyage of H.M.S. Beagle [vol. 1 of 5] : $b Fossil mammalia
Owen, Richard
514 Gutenberg downloadsen2022Difficulty 58 (Graduate)
Histology of medicinal plants
Mansfield, William James
513 Gutenberg downloadsen2021Difficulty 70 (Academic)
Appletons' Popular Science Monthly, March 1900 Vol. 56, Nov. 1899 to April, 1900
Various
512 Gutenberg downloadsen2014Difficulty 55 (Graduate)
Speciation and Evolution of the Pygmy Mice, Genus Baiomys
Packard, Robert L. (Robert Lewis)
512 Gutenberg downloadsen2011Difficulty 64 (Academic)
Half Hours With Modern Scientists: Lectures and Essays
Huxley, Thomas Henry & Barker, George F. (George Frederick) & Cope, E. D. (Edward Drinker) & Stirling, James Hutchison & Tyndall, John
510 Gutenberg downloadsen2021Difficulty 66 (Academic)
On the cattle plague: or, Contagious typhus in horned cattle. Its history, origin, description, and treatment
Bourguignon, Honoré
510 Gutenberg downloadsen2011Difficulty 69 (Academic)
Race Improvement; or, Eugenics: A Little Book on a Great Subject
Baker, La Reine Helen McKenzie
510 Gutenberg downloadsen2015Difficulty 63 (Academic)
The apiary; or, bees, bee-hives, and bee culture [1865] Being a familiar account of the habits of bees, and the most improved methods of management, with full directions, adapted for the cottager, farmer, or scientific apiarian
Neighbor, Alfred
510 Gutenberg downloadsen2022Difficulty 63 (Academic)
The Botanical Magazine, Vol. 02 Or, Flower-Garden Displayed
Curtis, William
510 Gutenberg downloadsen2006Difficulty 57 (Graduate)
Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901
Calkins, Gary N. (Gary Nathan)
509 Gutenberg downloadsen2006Difficulty 56 (Graduate)
Science from an Easy Chair
Lankester, E. Ray (Edwin Ray), Sir
509 Gutenberg downloadsen2018Difficulty 52 (Graduate)
Sertum Anglicum, seu, Plantae Rariores quae in Hortis Juxta Londinum Imprimis in Horto Regio Kewensi excoluntur, ab anno 1786 ad annum 1787 observata
L'Héritier de Brutelle, Charles Louis
509 Gutenberg downloadsla2012
Nouvel atlas de poche des champignons Comestibles et Vénéneux les plus répandus. Série I (Troisième édition) Suivi de notions générales sur les champignons, leur classification, composition chimique, valeur alimentaire, préparation
Dumée, Paul
508 Gutenberg downloadsfr2010
The Elements of Agriculture A Book for Young Farmers, with Questions Prepared for the Use of Schools
Waring, George E. (George Edwin)
508 Gutenberg downloadsen2010Difficulty 53 (Graduate)
A Mechanico-Physiological Theory of Organic Evolution
Nägeli, Carl
507 Gutenberg downloadsen2010Difficulty 74 (Expert)
The Study of Plant Life
Stopes, Marie Carmichael
507 Gutenberg downloadsen2019Difficulty 43 (College)
God and the World: A Survey of Thought
Robinson, Arthur William
506 Gutenberg downloadsen2009Difficulty 60 (Graduate)
On the Reception of the 'Origin of Species'
Huxley, Thomas Henry
506 Gutenberg downloadsen2000Difficulty 66 (Academic)
Respiration Calorimeters for Studying the Respiratory Exchange and Energy Transformations of Man
Benedict, Francis Gano & Carpenter, Thorne M. (Thorne Martin)
506 Gutenberg downloadsen2009Difficulty 66 (Academic)
The Behavior of the Honey Bee in Pollen Collecting
Casteel, Dana Brackenridge
505 Gutenberg downloadsen2012Difficulty 54 (Graduate)
Forest Trees of Illinois: How to Know Them
Fuller, George D. (George Damon) & Mattoon, Wilbur R. (Wilbur Reed) & Miller, Robert B. (Robert Barclay) & Nuuttila, E. E.
504 Gutenberg downloadsen2011Difficulty 50 (College)
Meinauer Naturlehre
Unknown
504 Gutenberg downloadsde2009
The Beaked Whales of the Family Ziphiidae An Account of the Beaked Whales of the Family Ziphiidae in the Collection of the United States Museum...
True, Frederick W. (Frederick William)
504 Gutenberg downloadsen2014Difficulty 54 (Graduate)
The Wild Elephant and the Method of Capturing and Taming it in Ceylon
Tennent, James Emerson, Sir
504 Gutenberg downloadsen2018Difficulty 65 (Academic)
Agricultural zoology
Ritzema Bos, J. (Jan)
503 Gutenberg downloadsen2025Difficulty 52 (Graduate)
Animal portraiture
Lydekker, Richard
503 Gutenberg downloadsen2023Difficulty 58 (Graduate)
British Sea Birds
Dixon, Charles
503 Gutenberg downloadsen2014Difficulty 61 (Academic)
Catholic Churchmen in Science [First Series] Sketches of the Lives of Catholic Ecclesiastics Who Were Among the Great Founders in Science
Walsh, James J. (James Joseph)
502 Gutenberg downloadsen2010Difficulty 67 (Academic)
Irritability : $b a physiological analysis of the general effect of stimuli in living substance
Verworn, Max
502 Gutenberg downloadsen2021Difficulty 65 (Academic)
The Adductor Muscles of the Jaw In Some Primitive Reptiles
Fox, Richard C.
502 Gutenberg downloadsen2009Difficulty 66 (Academic)
The Destiny of Man, Viewed in the Light of His Origin
Fiske, John
502 Gutenberg downloadsen2005Difficulty 65 (Academic)
Bees
Phillips, Everett Franklin
501 Gutenberg downloadsen2015Difficulty 52 (Graduate)
The cretaceous birds of New Jersey
Olson, Storrs L. & Parris, David C.
500 Gutenberg downloadsen2022Difficulty 69 (Academic)
An Annotated Check List of the Mammals of Michoacán, México
Hall, E. Raymond (Eugene Raymond) & Villa Ramírez, Bernardo
499 Gutenberg downloadsen2012Difficulty 55 (Graduate)
The Pros and Cons of Vivisection
Richet, Charles
499 Gutenberg downloadsen2011Difficulty 63 (Academic)
Through a Microscope Something of the Science, Together with many Curious Observations Indoor and Out and Directions for a Home-made Microscope.
Wells, Samuel & Sargent, Frederick Leroy & Treat, Mary
499 Gutenberg downloadsen2011Difficulty 48 (College)
Aromatics and the Soul: A Study of Smells
McKenzie, Dan
498 Gutenberg downloadsen2019Difficulty 53 (Graduate)
New observations on the natural history of bees
Huber, François
498 Gutenberg downloadsen2008Difficulty 57 (Graduate)
The Migration of Birds
Coward, T. A. (Thomas Alfred)
498 Gutenberg downloadsen2013Difficulty 67 (Academic)
Μικρά Φυσικά, Τόμος Πρώτος
Aristotle
498 Gutenberg downloadsel2009
Rede, gehalten bei der Eröffnung der Versammlung deutscher Naturforscher und Ärzte in Berlin, am 18. September 1828
Humboldt, Alexander von
497 Gutenberg downloadsde2007
Through a pocket lens
Scherren, Henry
497 Gutenberg downloadsen2022Difficulty 43 (College)
Flytraps and Their Operation [1930]
Bishopp, F. C. (Fred Corry)
496 Gutenberg downloadsen2020Difficulty 51 (Graduate)
La simulación en la lucha por la vida
Ingenieros, José
496 Gutenberg downloadses2020
Significant Achievements in Space Bioscience 1958-1964
United States. National Aeronautics and Space Administration
496 Gutenberg downloadsen2012Difficulty 76 (Expert)
The botanist's repository for new and rare plants; vol. 01 & 02 [of 10]
Andrews, Henry Cranke, active 1799-1828
496 Gutenberg downloadsen2023Difficulty 57 (Graduate)
Common objects of the microscope
Wood, J. G. (John George)
495 Gutenberg downloadsen2017Difficulty 69 (Academic)
Graphic illustrations of abortion and the diseases of menstruation Consisting of Twelve Plates from Drawings Engraved on Stone, and Coloured by Mr. J. Perry, and Two Copper-plates from the Philosophical Transactions, Coloured by the Same Artist. the Whole Representing Forty-five Specimens of Aborted Ova and Adventitious Productions of the Uterus, With Preliminary Observations, Explanations of the Figures and Remarks, Anatomical and Physiological.
Granville, A. B. (Augustus Bozzi)
495 Gutenberg downloadsen2019Difficulty 61 (Academic)
Notes on Diseases of Cattle: Cause, Symptoms and Treatment
Korinek, Charles James
495 Gutenberg downloadsen2019Difficulty 55 (Graduate)
Scientific American Supplement, No. 299, September 24, 1881
Various
495 Gutenberg downloadsen2005Difficulty 60 (Graduate)
Through Magic Glasses and Other Lectures A Sequel to The Fairyland of Science
Buckley, Arabella B. (Arabella Burton)
495 Gutenberg downloadsen2011Difficulty 58 (Graduate)
A New Doglike Carnivore, Genus Cynarctus, From the Clarendonian, Pliocene, of Texas
Hall, E. Raymond (Eugene Raymond) & Dalquest, Walter Woelber
494 Gutenberg downloadsen2009Difficulty 53 (Graduate)
An Experimental Translocation of the Eastern Timber Wolf
Weise, Thomas F. & Hook, Richard A. & Mech, L. David & Robinson, William Laughlin
494 Gutenberg downloadsen2011Difficulty 56 (Graduate)
The Brain, A Decoded Enigma
Moisa, Dorin Teodor
494 Gutenberg downloadsen2005Difficulty 58 (Graduate)
Beginners' zoology
Coleman, Walter Moore
493 Gutenberg downloadsen2024Difficulty 46 (College)
Chambers's Elementary Science Readers Book I
Various
493 Gutenberg downloadsen2006Difficulty 27 (Middle School)
Fathers of Biology
McRae, Charles
492 Gutenberg downloadsen2008Difficulty 64 (Academic)
Souvenirs entomologiques - Livre I Étude sur l'instinct et les moeurs des insectes
Fabre, Jean-Henri
492 Gutenberg downloadsfr2005
The Natural History of Chocolate Being a Distinct and Particular Account of the Cocoa-Tree, its Growth and Culture, and the Preparation, Excellent Properties, and Medicinal Vertues of its Fruit
Quélus, D.
492 Gutenberg downloadsen2008Difficulty 52 (Graduate)
Nouveaux souvenirs entomologiques - Livre II Étude sur l'instinct et les moeurs des insectes
Fabre, Jean-Henri
491 Gutenberg downloadsfr2006
Territory in Bird Life
Howard, Henry Eliot
491 Gutenberg downloadsen2010Difficulty 62 (Academic)
A Theory of Creation: A Review of 'Vestiges of the Natural History of Creation'
Bowen, Francis
490 Gutenberg downloadsen2008Difficulty 67 (Academic)
Cassell's book of birds; vol. 2
Brehm, Alfred Edmund
490 Gutenberg downloadsen2018Difficulty 58 (Graduate)
Essays on Darwinism
Stebbing, Thomas Roscoe Rede
490 Gutenberg downloadsen2015Difficulty 63 (Academic)
Studies on Epidemic Influenza: Comprising Clinical and Laboratory Investigations
University of Pittsburgh. School of Medicine
490 Gutenberg downloadsen2019Difficulty 62 (Academic)
The Chautauquan, Vol. 05, June 1885, No. 9
Chautauqua Literary and Scientific Circle & Chautauqua Institution
490 Gutenberg downloadsen2017Difficulty 53 (Graduate)
The Microscope
Ross, Andrew
490 Gutenberg downloadsen2013Difficulty 65 (Academic)
The Life and Letters of George John Romanes, M.A., LL.D., F.R.S.
Romanes, George John & Romanes, Ethel Duncan
488 Gutenberg downloadsen2015Difficulty 52 (Graduate)
The Principles of Breeding or, Glimpses at the Physiological Laws involved in the Reproduction and Improvement of Domestic Animals
Goodale, S. L. (Stephen Lincoln)
488 Gutenberg downloadsen2007Difficulty 57 (Graduate)
Evolution and creation
Hardwicke, Herbert Junius
487 Gutenberg downloadsen2017Difficulty 64 (Academic)
House Rats and Mice
Lantz, David E. (David Ernest)
487 Gutenberg downloadsen2011Difficulty 51 (Graduate)
Scientific American Supplement, No. 315, January 14, 1882
Various
487 Gutenberg downloadsen2006Difficulty 63 (Academic)
The Dwelling House
Poore, George Vivian
487 Gutenberg downloadsen2015Difficulty 52 (Graduate)
Scientific American Supplement, No. 613, October 1, 1887
Various
486 Gutenberg downloadsen2005Difficulty 63 (Academic)
Was Man Created?
Mott, Henry A. (Henry Augustus)
486 Gutenberg downloadsen2009Difficulty 66 (Academic)
A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, México
Duellman, William Edward
485 Gutenberg downloadsen2011Difficulty 65 (Academic)
How to Know the Ferns
Bastin, S. Leonard
485 Gutenberg downloadsen2014Difficulty 50 (College)
Scientific American Supplement, No. 795, March 28, 1891
Various
484 Gutenberg downloadsen2004Difficulty 62 (Academic)
The honey bee: a manual of instruction in apiculture
Benton, Frank
484 Gutenberg downloadsen2022Difficulty 55 (Graduate)
Last Words on Evolution: A Popular Retrospect and Summary
Haeckel, Ernst
483 Gutenberg downloadsen2016Difficulty 68 (Academic)
Life among the butterflies
Randolph, Vance
483 Gutenberg downloadsen2022Difficulty 56 (Graduate)
Migration of Birds (1950)
Lincoln, Frederick Charles
483 Gutenberg downloadsen2021Difficulty 70 (Academic)
Monism as Connecting Religion and Science A Man of Science
Haeckel, Ernst
483 Gutenberg downloadsen2005Difficulty 74 (Expert)
Het Leven der Dieren: Deel 2, Hoofdstuk 04: De Hoendervogels
Brehm, Alfred Edmund
482 Gutenberg downloadsnl2009
Buchanan's Journal of Man, August 1887 Volume 1, Number 7
Unknown
481 Gutenberg downloadsen2008Difficulty 63 (Academic)
Death and resurrection from the point of view of the cell-theory
Björklund, Gustaf
481 Gutenberg downloadsen2019Difficulty 58 (Graduate)
The Birds of Australia, Vol. 1 of 7
Gould, John
481 Gutenberg downloadsen2021Difficulty 45 (College)
The Migration of North American Birds (1935)
Lincoln, Frederick Charles
481 Gutenberg downloadsen2021Difficulty 71 (Expert)
William Harvey and the Discovery of the Circulation of the Blood
Huxley, Thomas Henry
481 Gutenberg downloadsen2001Difficulty 62 (Academic)
American Addresses, with a Lecture on the Study of Biology
Huxley, Thomas Henry
480 Gutenberg downloadsen2005Difficulty 67 (Academic)
Ecological Observations on the Woodrat, Neotoma floridana
Fitch, Henry S. (Henry Sheldon) & Rainey, Dennis G.
480 Gutenberg downloadsen2010Difficulty 59 (Graduate)
Grundriß der menschlichen Erblichkeitslehre und Rassenhygiene (2/2) Menschliche Auslese und Rassenhygiene
Lenz, Fritz
480 Gutenberg downloadsde2015
Measles
Rucker, William Colby
480 Gutenberg downloadsen2006Difficulty 50 (College)
New-England's rarities discovered : $b In birds, beasts, fishes, serpents, and plants of that country
Josselyn, John, active 1630-1675
480 Gutenberg downloadsen2023Difficulty 57 (Graduate)
The Ornithosauria An elementary study of the bones of Pterodactyles made from fossil remains found in the Cambridge Upper Greensand, and arranged in the Woodwardian Museum of the University of Cambridge
Seeley, H. G. (Harry Govier)
480 Gutenberg downloadsen2016Difficulty 58 (Graduate)
A New Subspecies of Wood Rat (Neotoma mexicana) from Colorado
Finley, Robert B.
479 Gutenberg downloadsen2010Difficulty 60 (Graduate)
Apes and Monkeys: Their Life and Language
Garner, R. L. (Richard Lynch)
479 Gutenberg downloadsen2022Difficulty 55 (Graduate)
Food Habits of the Thrushes of the United States
Beal, F. E. L. (Foster Ellenborough Lascelles)
479 Gutenberg downloadsen2010Difficulty 54 (Graduate)
Speciation of the Wandering Shrew
Findley, James S. (James Smith)
479 Gutenberg downloadsen2011Difficulty 62 (Academic)
Species Plantarum, Sections VI-X
Linné, Carl von
479 Gutenberg downloadsla2009
Studies in the Theory of Descent (Volumes 1 and 2)
Weismann, August
479 Gutenberg downloadsen2015Difficulty 68 (Academic)
Synopsis of Some Genera of the Large Pyrenomycetes Camillea, Thamnomyces, Engleromyces
Lloyd, C. G. (Curtis Gates)
479 Gutenberg downloadsen2007Difficulty 52 (Graduate)
Die epiphytische Vegetation Amerikas
Schimper, A. F. W. (Andreas Franz Wilhelm)
478 Gutenberg downloadsde2007
Flora von Deutschland Ein Hilfsbuch zum Bestimmen der zwischen den deutschen Meeren und den Alpen wildwachsenden und angebauten Pflanzen
Schmeil, O. (Otto) & Fitschen, Jost
477 Gutenberg downloadsde2019
Little Masterpieces of Science: Health and Healing
Unknown
477 Gutenberg downloadsen2014Difficulty 53 (Graduate)
The Rocky Mountain Goat
Grant, Madison
477 Gutenberg downloadsen2015Difficulty 57 (Graduate)
Comments on the Taxonomy and Geographic Distribution of Some North American Marsupials, Insectivores and Carnivores
Hall, E. Raymond (Eugene Raymond) & Kelson, Keith R.
476 Gutenberg downloadsen2010Difficulty 58 (Graduate)
Flowers of mountain and plain
Clements, Edith S. (Edith Schwartz)
476 Gutenberg downloadsen2014Difficulty 50 (College)
Mazedonien : $b Erlebnisse und Beobachtungen eines Naturforschers im Gefolge des deutschen Heeres
Doflein, Franz
476 Gutenberg downloadsde2023
The Genera of Phyllomedusine Frogs (Anura: Hylidae)
Duellman, William Edward
476 Gutenberg downloadsen2010Difficulty 74 (Expert)
The Scientific Evidences of Organic Evolution
Romanes, George John
476 Gutenberg downloadsen2006Difficulty 67 (Academic)
A Review of the Middle American Tree Frogs of the Genus Ptychohyla
Duellman, William Edward
475 Gutenberg downloadsen2011Difficulty 58 (Graduate)
Anthropoid apes
Hartmann, Robert
475 Gutenberg downloadsen2025Difficulty 53 (Graduate)
Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado
Douglas, Charles L.
475 Gutenberg downloadsen2012Difficulty 63 (Academic)
Essays in Natural History and Agriculture
Garnett, Thomas
475 Gutenberg downloadsen2006Difficulty 64 (Academic)
Natural History of the Prairie Vole (Mammalian Genus Microtus) [KU. Vol. 1 No. 7]
Jameson, E. W. (Everett Williams)
475 Gutenberg downloadsen2011Difficulty 52 (Graduate)
Neotropical Hylid Frogs, Genus Smilisca
Duellman, William Edward & Trueb, Linda
475 Gutenberg downloadsen2011Difficulty 60 (Graduate)
On the Preparations of the Indian Hemp, or Gunjah (Cannabis Indica) Their Effects on the Animal System in Health, and Their Utility in the Treatment of Tetanus and Other Convulsive Diseases
O'Shaughnessy, W. B.
475 Gutenberg downloadsen2022Difficulty 63 (Academic)
The Academic Gregories
Stewart, Agnes Grainger
475 Gutenberg downloadsen2016Difficulty 59 (Graduate)
The Forests of Mount Rainier National Park
Allen, G. F. (Grenville F.)
475 Gutenberg downloadsen2010Difficulty 49 (College)
Life's Dawn on Earth Being the history of the oldest known fossil remains, and their relations to geological time and to the development of the animal kingdom
Dawson, John William, Sir
474 Gutenberg downloadsen2015Difficulty 58 (Graduate)
Scientific American magazine Vol 2. No. 3 Oct 10 1846 The Advocate of Industry and Journal of Scientific, Mechanical and Other Improvements
Various
474 Gutenberg downloadsen2009Difficulty 49 (College)
Subspeciation in the Kangaroo Rat, Dipodomys ordii KU. Vol 1 No 23
Setzer, Henry W.
474 Gutenberg downloadsen2013Difficulty 66 (Academic)
Illustrations of Exotic Entomology, Volume 3
Drury, Dru
473 Gutenberg downloadsen2014Difficulty 57 (Graduate)
L'Académie des sciences et les académiciens de 1666 à 1793
Bertrand, Joseph
473 Gutenberg downloadsfr2016
Scientific American Supplement, No. 595, May 28, 1887
Various
473 Gutenberg downloadsen2004Difficulty 52 (Graduate)
The Story of Germ Life
Conn, H. W. (Herbert William)
473 Gutenberg downloadsen2004Difficulty 60 (Graduate)
The Essentials of Illustration A Practical Guide to the Reproduction of Drawings & Photographs for the Use of Scientists & Others
Hill, Thomas George
472 Gutenberg downloadsen2011Difficulty 58 (Graduate)
An elementary manual of New Zealand entomology : $b being an introduction to the study of our native insects
Hudson, G. V. (George Vernon)
471 Gutenberg downloadsen2013Difficulty 54 (Graduate)
Life: Its True Genesis
Flaccus, Horatius
471 Gutenberg downloadsen2005Difficulty 60 (Graduate)
Scientific American, Vol. XXXIX.No. 6. [New Series.], August 10, 1878
Various
471 Gutenberg downloadsen2013Difficulty 54 (Graduate)
De Reis om de Wereld
Darwin, Charles
470 Gutenberg downloadsnl2010
Evolution of Life and Form Four lectures delivered at the twenty-third anniversary meeting of the Theosophical Society at Adyar, Madras, 1898
Besant, Annie
470 Gutenberg downloadsen2012Difficulty 60 (Graduate)
Jaundice: Its Pathology and Treatment With the Application of Physiological Chemistry to the Detection and Treatment of Diseases of the Liver and Pancreas
Harley, George
470 Gutenberg downloadsen2015Difficulty 69 (Academic)
Mushrooms of America, Edible and Poisonous
Unknown
470 Gutenberg downloadsen2009Difficulty 49 (College)
Scientific American Supplement, No. 363, December 16, 1882
Various
470 Gutenberg downloadsen2005Difficulty 62 (Academic)
Seed Dispersal
Beal, W. J. (William James)
470 Gutenberg downloadsen2008Difficulty 46 (College)
Stray Feathers From a Bird Man's Desk
Rand, Austin Loomer
470 Gutenberg downloadsen2021Difficulty 54 (Graduate)
A guide to the shell and starfish galleries : $b (Mollusca, Polyzoa, Brachiopoda, Tunicata, Echinoderma, and Worms)
British Museum (Natural History). Department of Zoology & Bell, F. J. (Francis Jeffrey) & Kirkpatrick, R. (Randolph) & Smith, E. A. (Edgar Albert)
469 Gutenberg downloadsen2024Difficulty 59 (Graduate)
A New Extinct Emydid Turtle from the Lower Pliocene of Oklahoma
Galbreath, Edwin C. (Edwin Carter)
469 Gutenberg downloadsen2010Difficulty 59 (Graduate)
Noteworthy Mammals from Sinaloa, Mexico
Jones, J. Knox & Alvarez, Ticul & Lee, M. Raymond
469 Gutenberg downloadsen2010Difficulty 52 (Graduate)
Observations on the Mississippi Kite in Southwestern Kansas
Fitch, Henry S. (Henry Sheldon)
468 Gutenberg downloadsen2010Difficulty 55 (Graduate)
The fauna of the deep sea
Hickson, Sydney J. (Sydney John)
468 Gutenberg downloadsen2021Difficulty 63 (Academic)
A Statistical Inquiry Into the Nature and Treatment of Epilepsy
Bennett, Alexander Hughes
467 Gutenberg downloadsen2011Difficulty 44 (College)
Additions to the List of the Birds of Louisiana
Lowery, George H., Jr.
467 Gutenberg downloadsen2010Difficulty 61 (Academic)
Scientific American Supplement, No. 441, June 14, 1884.
Various
467 Gutenberg downloadsen2005Difficulty 56 (Graduate)
The Vivisectors' Directory Being a list of the licensed vivisectors in the United Kingdom, together with the leading physiologists in foreign laboratories
Unknown
467 Gutenberg downloadsen2017Difficulty 61 (Academic)
The Evolutionist at Large
Allen, Grant
466 Gutenberg downloadsen2014Difficulty 55 (Graduate)
A Monograph of Odontoglossum
Bateman, Jas. (James)
465 Gutenberg downloadsen2014Difficulty 61 (Academic)
Die Cellularpathologie in ihrer Begründung auf physiologische und pathologische Gewebelehre
Virchow, Rudolf
465 Gutenberg downloadsde2014
On the phenomena of hybridity in the genus Homo
Broca, Paul
465 Gutenberg downloadsen2014Difficulty 66 (Academic)
Relics of Primeval Life: Beginning of Life in the Dawn of Geological Time
Dawson, John William, Sir
465 Gutenberg downloadsen2022Difficulty 58 (Graduate)
Studies in Spermatogenesis (Part 1 of 2)
Stevens, N. M. (Nettie Maria)
465 Gutenberg downloadsen2010Difficulty 57 (Graduate)
The Mammals of Washtenaw County, Michigan Occasional Papers of the Museum of Zoology, No. 123
Wood, Norman Asa
465 Gutenberg downloadsen2010Difficulty 44 (College)
Creation and Its Records A Brief Statement of Christian Belief with Reference to Modern Facts and Ancient Scripture
Baden-Powell, B. H. (Baden Henry)
464 Gutenberg downloadsen2004Difficulty 62 (Academic)
The Making of Species
Dewar, Douglas & Finn, Frank
464 Gutenberg downloadsen2013Difficulty 72 (Expert)
Flytraps and Their Operation [1921]
Bishopp, F. C. (Fred Corry)
463 Gutenberg downloadsen2020Difficulty 48 (College)
Scientific American magazine, Vol. 2 Issue 1 The advocate of Industry and Journal of Scientific, Mechanical and Other Improvements
Various
463 Gutenberg downloadsen2009Difficulty 52 (Graduate)
Appletons' Popular Science Monthly, February 1900 Vol. 56, November, 1899 to April, 1900
Various
462 Gutenberg downloadsen2014Difficulty 62 (Academic)
Development of the Digestive Canal of the American Alligator
Reese, A. M. (Albert Moore)
462 Gutenberg downloadsen2007Difficulty 58 (Graduate)
Additional Records and Extensions of Known Ranges of Mammals from Utah
Durrant, Stephen David & Hansen, Richard M. & Lee, M. Raymond
461 Gutenberg downloadsen2010Difficulty 57 (Graduate)
Evolution: An Investigation and a Critique
Graebner, Theodore
461 Gutenberg downloadsen2006Difficulty 62 (Academic)
On the Origin and Metamorphoses of Insects
Lubbock, John, Sir
461 Gutenberg downloadsen2011Difficulty 54 (Graduate)
Scientific American Supplement, No. 664, September 22,1888
Various
461 Gutenberg downloadsen2008Difficulty 58 (Graduate)
Scientific American Supplement, No. 324, March 18, 1882
Various
460 Gutenberg downloadsen2005Difficulty 53 (Graduate)
Scientific American Supplement, No. 492, June 6, 1885
Various
460 Gutenberg downloadsen2004Difficulty 53 (Graduate)
An Account of the Late Improvements in Galvanism With a Series of Curious and Interesting Experiments Performed Before the Commissioners of the French National Institute, and Repeated Lately in the Anatomical Theatres of London
Aldini, Giovanni
459 Gutenberg downloadsen2018Difficulty 64 (Academic)
Birds Found on the Arctic Slope of Northern Alaska
Bee, James W.
459 Gutenberg downloadsen2010Difficulty 42 (College)
Birds' Nests, Eggs and Egg-Collecting
Kearton, Richard
459 Gutenberg downloadsen2014Difficulty 65 (Academic)
Earthworms and Their Allies
Beddard, Frank E. (Frank Evers)
459 Gutenberg downloadsen2013Difficulty 59 (Graduate)
Guide to the study of animal ecology
Adams, Charles C. (Charles Christopher)
459 Gutenberg downloadsen2023Difficulty 66 (Academic)
On Germinal Selection as a Source of Definite Variation
Weismann, August
459 Gutenberg downloadsen2010Difficulty 69 (Academic)
Studies in the Evolutionary Psychology of Feeling
Stanley, Hiram Miner
459 Gutenberg downloadsen2018Difficulty 62 (Academic)
The horse's mouth, showing the age by the teeth
Mayhew, Edward
459 Gutenberg downloadsen2014Difficulty 55 (Graduate)
Variation in the Muscles and Nerves of the Leg in Two Genera of Grouse (Tympanuchus and Pedioecetes)
Holmes, E. Bruce
459 Gutenberg downloadsen2013Difficulty 55 (Graduate)
Appletons' Popular Science Monthly, January 1899 Volume LIV, No. 3, January 1899
Various
458 Gutenberg downloadsen2013Difficulty 56 (Graduate)
Nouvel atlas de poche des champignons Comestibles et Vénéneux les plus répandus. Série II (Première édition)
Dumée, Paul
458 Gutenberg downloadsfr2017
Scientific American Supplement, No. 810, July 11, 1891
Various
458 Gutenberg downloadsen2005Difficulty 51 (Graduate)
Nests and Eggs of Familiar British Birds, Second Series Described and Illustrated; with an Account of the Haunts and Habits of the Feathered Architects, and their Times and Modes of Building
Adams, H. G. (Henry Gardiner)
457 Gutenberg downloadsen2012Difficulty 60 (Graduate)
Scientific American Supplement, No. 787, January 31, 1891
Various
456 Gutenberg downloadsen2004Difficulty 53 (Graduate)
A conchological manual
Sowerby, G. B. (George Brettingham)
455 Gutenberg downloadsen2013Difficulty 64 (Academic)
Les Phénomènes Psychiques Occultes: État Actuel de la Question
Coste, Albert
455 Gutenberg downloadsfr2013
Preservation of Bull Semen at Sub-Zero Temperatures
VanDemark, N. L. & Friedman, M. E. & Kinney, W. C. & Miller, W. J. & Rodriguez, Carlos
455 Gutenberg downloadsen2011Difficulty 62 (Academic)
Appletons' Popular Science Monthly, November 1898 Volume 54, November 1898
Various
454 Gutenberg downloadsen2013Difficulty 60 (Graduate)
Outlines of Creation
Noyce, Elisha
454 Gutenberg downloadsen2015Difficulty 68 (Academic)
The Natural History of the Tea-Tree, with Observations on the Medical Qualities of Tea, and on the Effects of Tea-Drinking
Lettsom, John Coakley
454 Gutenberg downloadsen2021Difficulty 52 (Graduate)
Warum wir sterben
Lipschütz, Alejandro
454 Gutenberg downloadsde2008
A treatise on the esculent funguses of England containing an account of their classical history, uses, characters, development, structure, nutritious properties, modes of cooking and preserving, etc.
Badham, David
453 Gutenberg downloadsen2019Difficulty 68 (Academic)
Duality of Voice
Sutro, Emil
453 Gutenberg downloadsen2015Difficulty 63 (Academic)
Natural History of the Bell Vireo, Vireo bellii Audubon
Barlow, Jon C.
453 Gutenberg downloadsen2010Difficulty 59 (Graduate)
Parasiten der Honigbiene und die durch dieselben bedingten Krankheiten dieses Insects.
Assmuss, Eduard Philibert
453 Gutenberg downloadsde2006
Scientific American Supplement, No. 601, July 9, 1887
Various
453 Gutenberg downloadsen2004Difficulty 53 (Graduate)
The Diatomaceæ of Philadelphia and Vicinity
Boyer, Charles S. (Charles Sumner)
453 Gutenberg downloadsen2014Difficulty 67 (Academic)
Himalayan Journals — Volume 2 Or, Notes of a Naturalist in Bengal, the Sikkim and Nepal Himalayas, the Khasia Mountains, etc.
Hooker, Joseph Dalton
452 Gutenberg downloadsen2004Difficulty 69 (Academic)
An Account of the Insects Noxious to Agriculture and Plants in New Zealand The Scale Insects (Coccididae)
Maskell, William Miles
451 Gutenberg downloadsen2015Difficulty 53 (Graduate)
Descriptive Zoopraxography; or, the science of animal locomotion made popular
Muybridge, Eadweard
451 Gutenberg downloadsen2012Difficulty 72 (Expert)
Die Naturwissenschaften in ihrer Entwicklung und in ihrem Zusammenhange, II. Band Von Galilei bis zur Mitte des XVIII. Jahrhunderts
Dannemann, Friedrich
451 Gutenberg downloadsde2017
The flowering plants of South Africa; vol. 3
Pole Evans, I. B. (Illtyd Buller)
451 Gutenberg downloadsen2021Difficulty 52 (Graduate)
The House Fly and How to Suppress It
Howard, L. O. (Leland Ossian) & Bishopp, F. C. (Fred Corry)
451 Gutenberg downloadsen2006Difficulty 54 (Graduate)
Water Reptiles of the Past and Present
Williston, Samuel Wendell
451 Gutenberg downloadsen2022Difficulty 63 (Academic)
De Plantis Esculentis Insularum Oceani Australis Commentatio Botanica
Forster, Georg
450 Gutenberg downloadsla2011
Journal of Entomology and Zoology, Vol. 11, No. 2, June 1919
Various
450 Gutenberg downloadsen2010Difficulty 54 (Graduate)
Les grands froids
Bouant, Emile
450 Gutenberg downloadsfr2013
Marxism and Darwinism : $b Evidence, speeches, and papers in its favour
Pannekoek, Anton
450 Gutenberg downloadsen2023Difficulty 58 (Graduate)
Phylogeny of the Waxwings and Allied Birds
Arvey, M. Dale (Martin Dale)
450 Gutenberg downloadsen2010Difficulty 66 (Academic)
Barium: A Cause of the Loco-Weed Disease
Crawford, Albert C. (Albert Cornelius)
449 Gutenberg downloadsen2012Difficulty 57 (Graduate)
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Cool, Cath. (Catharina) & Lek, H. A. A. van der (Hendrik Adrianus Abraham)
449 Gutenberg downloadsnl2015
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Hansen, G. Armauer (Gerhard Armauer) & Looft, Carl
449 Gutenberg downloadsen2023Difficulty 64 (Academic)
The Popular Science Monthly, July, 1900 Vol. 57, May, 1900 to October, 1900
Various
449 Gutenberg downloadsen2014Difficulty 56 (Graduate)
Jaw Musculature of the Mourning and White-winged Doves
Merz, Robert L.
448 Gutenberg downloadsen2010Difficulty 58 (Graduate)
Lehrbuch der Botanik für Hochschulen
Strasburger, Eduard & Noll, Fritz & Schenck, H. (Heinrich) & Schimper, A. F. W. (Andreas Franz Wilhelm)
448 Gutenberg downloadsde2020
Noteworthy Records of Bats From Nicaragua, with a Checklist of the Chiropteran Fauna of the Country
Jones, J. Knox & Smith, James Dale & Turner, Ronald W.
448 Gutenberg downloadsen2010Difficulty 56 (Graduate)
Prehistoric man
Duckworth, W. L. H. (Wynfrid Laurence Henry)
448 Gutenberg downloadsen2013Difficulty 57 (Graduate)
Useful Knowledge: Volume 3. Animals Or, a familiar account of the various productions of nature
Bingley, William
448 Gutenberg downloadsen2018Difficulty 54 (Graduate)
Inheritance of Characteristics in Domestic Fowl
Davenport, Charles Benedict
447 Gutenberg downloadsen2015Difficulty 50 (College)
Sanitation in Panama
Gorgas, William Crawford
447 Gutenberg downloadsen2023Difficulty 56 (Graduate)
The zoology of the voyage of H.M.S. Beagle [vol. 2 of 5] : $b Mammalia
Waterhouse, G. R. (George Robert)
447 Gutenberg downloadsen2022Difficulty 53 (Graduate)
Educação nova: As bases
Alves dos Santos, Augusto Joaquim
446 Gutenberg downloadspt2012
Field Mice as Farm and Orchard Pests
Lantz, David E. (David Ernest)
446 Gutenberg downloadsen2013Difficulty 54 (Graduate)
Middle American Frogs of the Hyla microcephala Group
Duellman, William Edward & Fouquette, M. J.
446 Gutenberg downloadsen2010Difficulty 66 (Academic)
Vivisection
Leffingwell, Albert
446 Gutenberg downloadsen2010Difficulty 64 (Academic)
Comments on the Taxonomy and Geographic Distribution of North American Microtines
Hall, E. Raymond (Eugene Raymond) & Cockrum, E. Lendell
445 Gutenberg downloadsen2009Difficulty 62 (Academic)
Darwinism and Race Progress
Haycraft, John Berry
445 Gutenberg downloadsen2014Difficulty 71 (Expert)
Within the Deep Cassell's "Eyes and No Eyes" Series, Book VIII.
Smith, R. Cadwallader
445 Gutenberg downloadsen2004Difficulty 34 (High School)
Experiments and Observations Relative to the Influence Lately Discovered by M. Galvani and Commonly Called Animal Electricity
Fowler, Richard
444 Gutenberg downloadsen2014Difficulty 64 (Academic)
Greek Biology & Greek Medicine
Singer, Charles
444 Gutenberg downloadsen2020Difficulty 56 (Graduate)
Mammals taken Along the Alaska Highway
Baker, Rollin H. (Rollin Harold)
444 Gutenberg downloadsen2010Difficulty 47 (College)
On the Advisableness of Improving Natural Knowledge
Huxley, Thomas Henry
444 Gutenberg downloadsen2001Difficulty 72 (Expert)
The Structure and Habits of Spiders
Emerton, J. H. (James Henry)
444 Gutenberg downloadsen2018Difficulty 44 (College)
The Subspecific Status of Two Central American Sloths
Hall, E. Raymond (Eugene Raymond) & Kelson, Keith R.
444 Gutenberg downloadsen2010Difficulty 62 (Academic)
A Review of the Frogs of the Hyla bistincta Group
Duellman, William Edward
442 Gutenberg downloadsen2010Difficulty 60 (Graduate)
A Revision of Snakes of the Genus Conophis (Family Colubridae, from Middle America)
Wellman, John
442 Gutenberg downloadsen2011Difficulty 59 (Graduate)
Bird studies with a camera : $b with introductory chapters on the outfit and methods of the bird photographer
Chapman, Frank M. (Frank Michler)
442 Gutenberg downloadsen2025Difficulty 50 (College)
Grundzüge der Paläontologie (Paläozoologie). 2. Abteilung: Vertebrata.
Zittel, Karl Alfred von
442 Gutenberg downloadsde2025
Mammals of Mesa Verde National Park, Colorado
Anderson, Sydney
442 Gutenberg downloadsen2010Difficulty 53 (Graduate)
Methods of Destroying Rats
Lantz, David E. (David Ernest)
442 Gutenberg downloadsen2010Difficulty 55 (Graduate)
Mr. Gladstone and Genesis Essay #5 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
442 Gutenberg downloadsen2001Difficulty 59 (Graduate)
On the origin of inflammation of the veins and of the causes, consequences, and treatment of purulent deposits
Lee, Henry, M.D.
442 Gutenberg downloadsen2014Difficulty 65 (Academic)
Scientific American Supplement, No. 794, March 21, 1891
Various
442 Gutenberg downloadsen2005Difficulty 52 (Graduate)
The Popular Science Monthly, August, 1900 Vol. 57, May, 1900 to October, 1900
Various
442 Gutenberg downloadsen2014Difficulty 68 (Academic)
A Population Study of the Prairie Vole (Microtus ochrogaster) in Northeastern Kansas
Martin, Edwin Perry
441 Gutenberg downloadsen2012Difficulty 61 (Academic)
Fishes of the Wakarusa River in Kansas
Deacon, James E. & Metcalf, Artie L.
441 Gutenberg downloadsen2010Difficulty 45 (College)
Geographic Variation in the Pocket Gopher, Thomomys bottae, in Colorado
Youngman, Phillip M.
441 Gutenberg downloadsen2011Difficulty 57 (Graduate)
Handboek voor den kaasmaker in Nederland
Hollman, Pierre Jean
441 Gutenberg downloadsnl2010
On the Seashore Cassell's "Eyes and No Eyes" Series, Book VII
Smith, R. Cadwallader
441 Gutenberg downloadsen2003Difficulty 35 (High School)
A Field Study of the Kansas Ant-Eating Frog, Gastrophryne olivacea
Fitch, Henry S. (Henry Sheldon)
440 Gutenberg downloadsen2010Difficulty 55 (Graduate)
Comparative Breeding Behavior of Ammospiza caudacuta and A. maritima
Woolfenden, Glen Everett
440 Gutenberg downloadsen2011Difficulty 54 (Graduate)
The Minor Horrors of War
Shipley, A. E. (Arthur Everett), Sir
440 Gutenberg downloadsen2021Difficulty 51 (Graduate)
Geological Contemporaneity and Persistent Types of Life
Huxley, Thomas Henry
439 Gutenberg downloadsen2001Difficulty 72 (Expert)
The British Woodlice Being a Monograph of the Terrestrial Isopod Crustacea Occurring in the British Islands
Webb, Wilfred Mark & Sillem, Charles
439 Gutenberg downloadsen2013Difficulty 58 (Graduate)
The Doctrine of Evolution: Its Basis and Its Scope
Crampton, Henry Edward
439 Gutenberg downloadsen2005Difficulty 65 (Academic)
The Tadpoles of Bufo cognatus Say
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439 Gutenberg downloadsen2010Difficulty 54 (Graduate)
Home Range and Movements of the Eastern Cottontail in Kansas
Janes, Donald W.
438 Gutenberg downloadsen2009Difficulty 55 (Graduate)
The Botanical Magazine, Vol. 13 Or, Flower-Garden Displayed
Curtis, William & Sims, John
438 Gutenberg downloadsen2013Difficulty 58 (Graduate)
The Pocket Gophers (Genus Thomomys) of Utah University of Kansas Publications, Museum of Natural History, Vol. 1 No. 1
Durrant, Stephen David
438 Gutenberg downloadsen2012Difficulty 57 (Graduate)
The Botanical Magazine, Vol. 09 Or, Flower-Garden Displayed
Curtis, William
437 Gutenberg downloadsen2011Difficulty 58 (Graduate)
The Subspecies of the Mountain Chickadee
Grinnell, Joseph
437 Gutenberg downloadsen2010Difficulty 50 (College)
Geographic Distribution and Taxonomy of the Chipmunks of Wyoming
White, John A.
436 Gutenberg downloadsen2010Difficulty 50 (College)
Schenk's Theory: The Determination of Sex
Schenk, Samuel Leopold
436 Gutenberg downloadsen2014Difficulty 59 (Graduate)
The Coming of Evolution: The Story of a Great Revolution in Science
Judd, John W. (John Wesley)
436 Gutenberg downloadsen2010Difficulty 68 (Academic)
Theory of circulation by respiration : $b synopsis of its principles and history
Willard, Emma
436 Gutenberg downloadsen2006Difficulty 57 (Graduate)
The Atom and the Ocean
Hull, E. W. Seabrook
435 Gutenberg downloadsen2021Difficulty 61 (Academic)
The Bedbug [1934]
Marlatt, C. L.
435 Gutenberg downloadsen2020Difficulty 62 (Academic)
The Myxomycetes of the Miami Valley, Ohio
Morgan, A. P. (Andrew Price)
435 Gutenberg downloadsen2009Difficulty 63 (Academic)
Wintering Bees in Cellars
Phillips, Everett Franklin & Demuth, Geo. S. (George S.)
435 Gutenberg downloadsen2019Difficulty 52 (Graduate)
Appletons' Popular Science Monthly, May, 1900 Vol. 57, May, 1900 to October, 1900
Various
434 Gutenberg downloadsen2014Difficulty 60 (Graduate)
Geographic Variation in the Harvest Mouse, Reithrodontomys megalotis, On the Central Great Plains And in Adjacent Regions
Jones, J. Knox & Mursaloglu, B.
434 Gutenberg downloadsen2009Difficulty 56 (Graduate)
Scientific American Supplement, No. 385, May 19, 1883
Various
434 Gutenberg downloadsen2005Difficulty 58 (Graduate)
The Social Direction of Evolution: An Outline of the Science of Eugenics
Kellicott, William E. (William Erskine)
434 Gutenberg downloadsen2010Difficulty 63 (Academic)
Embryology: The Beginnings of Life
Leighton, Gerald R. (Gerald Rowley)
433 Gutenberg downloadsen2011Difficulty 59 (Graduate)
The History of Insects
Unknown
433 Gutenberg downloadsen2004Difficulty 55 (Graduate)
A New Bat (Myotis) From Mexico
Hall, E. Raymond (Eugene Raymond)
432 Gutenberg downloadsen2010Difficulty 57 (Graduate)
A New Subspecies of Lizard, Cnemidophorus sacki, from Michoacán, México
Duellman, William Edward
432 Gutenberg downloadsen2010Difficulty 58 (Graduate)
Scientific American Supplement, No. 433, April 19, 1884
Various
432 Gutenberg downloadsen2005Difficulty 66 (Academic)
Scientific American Supplement, No. 648, June 2, 1888.
Various
432 Gutenberg downloadsen2011Difficulty 54 (Graduate)
The Deseado Formation of Patagonia
Loomis, Frederic Brewster
432 Gutenberg downloadsen2024Difficulty 61 (Academic)
The Forest Habitat of the University of Kansas Natural History Reservation
Fitch, Henry S. (Henry Sheldon) & McGregor, Ronald L.
432 Gutenberg downloadsen2010Difficulty 59 (Graduate)
The Systematics of the Frogs of the Hyla Rubra Group in Middle America
León, Juan R.
432 Gutenberg downloadsen2010Difficulty 60 (Graduate)
Zoological Illustrations, Volume 3 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
432 Gutenberg downloadsen2012Difficulty 60 (Graduate)
Die Naturwissenschaften in ihrer Entwicklung und in ihrem Zusammenhange, I. Band Von den Anfängen bis zum Wiederaufleben der Wissenschaften
Dannemann, Friedrich
431 Gutenberg downloadsde2016
Scientific American Supplement, No. 275, April 9, 1881
Various
431 Gutenberg downloadsen2005Difficulty 57 (Graduate)
Species Plantarum, Sections XI-XIII
Linné, Carl von
431 Gutenberg downloadsla2010
The Gospel of Evolution From "The Atheistic Platform", Twelve Lectures
Aveling, Edward B.
431 Gutenberg downloadsen2011Difficulty 55 (Graduate)
Heroes of science : $b Botanists, zoologists, and geologists
Duncan, P. Martin (Peter Martin)
430 Gutenberg downloadsen2023Difficulty 58 (Graduate)
Ameboid movement
Schaeffer, Asa A. (Asa Arthur)
429 Gutenberg downloadsen2017Difficulty 66 (Academic)
De l'origine des espèces
Darwin, Charles
429 Gutenberg downloadsfr2004
Scientific American Supplement No. 822, October 3, 1891
Various
429 Gutenberg downloadsen2005Difficulty 55 (Graduate)
The human foot and the human hand
Humphry, George Murray, Sir
429 Gutenberg downloadsen2025Difficulty 48 (College)
Woher die Kindlein kommen
Hoppeler, Hans
429 Gutenberg downloadsde2009
Phrenology Examined
Flourens, P. (Pierre)
428 Gutenberg downloadsen2021Difficulty 59 (Graduate)
The Evolution of Man — Volume 2
Haeckel, Ernst
428 Gutenberg downloadsen2004Difficulty 55 (Graduate)
Biology : $b A lecture delivered at Columbia University in the series on Science, Philosophy and Art November 20, 1907
Wilson, Edmund B. (Edmund Beecher)
427 Gutenberg downloadsen2006Difficulty 69 (Academic)
Die Tier- und Pflanzenwelt des Süsswassers. Erster Band.
Forel, F. A. (François Alphonse) & Gruber, August & Ludwig, Friedrich & Migula, W. (Walter) & Plate, Ludwig & Vosseler, Julius & Weltner, Wilhelm
427 Gutenberg downloadsde2024
I funghi mangerecci e velenosi dell'Europa media con speciale riguardo a quelli che crescono nel Trentino - II edizione riveduta ed aumentata
Bresadola, Giacomo
427 Gutenberg downloadsit2013
The genetic and the operative evidence relating to secondary sexual characters
Morgan, Thomas Hunt
427 Gutenberg downloadsen2018Difficulty 47 (College)
Careers in Atomic Energy
McIlhenny, Loyce J.
426 Gutenberg downloadsen2013Difficulty 68 (Academic)
Grundzüge der Paläontologie (Paläozoologie). 1. Abteilung: Invertebrata.
Zittel, Karl Alfred von
426 Gutenberg downloadsde2023
The heathery; or, A monograph of the genus Erica. vol. 2
Andrews, Henry Cranke, active 1799-1828
426 Gutenberg downloadsen2023Difficulty 54 (Graduate)
Zoological Illustrations, Second Series, Volume 2 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
426 Gutenberg downloadsen2013Difficulty 60 (Graduate)
Intelligence in Plants and Animals Being a New Edition of the Author's Privately Issued "Soul and Immortality."
Gentry, Thomas G. (Thomas George)
425 Gutenberg downloadsen2021Difficulty 71 (Expert)
Some Common Birds Useful to the Farmer (1915 edition)
Beal, F. E. L. (Foster Ellenborough Lascelles)
425 Gutenberg downloadsen2020Difficulty 54 (Graduate)
The Arena, Volume 18, No. 93, August, 1897
Various
425 Gutenberg downloadsen2010Difficulty 51 (Graduate)
The Book of Shells Containing the Classes Mollusca, Conchifera, Cirrhipeda, Annulata, and Crustacea
Society for Promoting Christian Knowledge (Great Britain). Committee of General Literature and Education
425 Gutenberg downloadsen2019Difficulty 64 (Academic)
Birds of Guernsey (1879) And the Neighbouring Islands: Alderney, Sark, Jethou, Herm; Being a Small Contribution to the Ornitholony of the Channel Islands
Smith, Cecil
424 Gutenberg downloadsen2004Difficulty 65 (Academic)
Evolution Social and Organic
Lewis, Arthur M. (Arthur Morrow)
424 Gutenberg downloadsen2018Difficulty 57 (Graduate)
Pleistocene Bats from San Josecito Cave, Nuevo Leon, Mexico
Jones, J. Knox
424 Gutenberg downloadsen2009Difficulty 55 (Graduate)
Supplement to Harvesting Ants and Trap-Door Spiders
Moggridge, John Traherne & Pickard-Cambridge, Octavius
424 Gutenberg downloadsen2021Difficulty 59 (Graduate)
The Present Condition of Organic Nature Lecture I. (of VI.), "Lectures to Working Men", at the Museum of Practical Geology, 1863, on Darwin's Work: "Origin of Species"
Huxley, Thomas Henry
424 Gutenberg downloadsen2001Difficulty 64 (Academic)
Criticisms on "The Origin of Species" From 'The Natural History Review', 1864
Huxley, Thomas Henry
423 Gutenberg downloadsen2001Difficulty 64 (Academic)
Scientific American Supplement, No. 455, September 20, 1884
Various
423 Gutenberg downloadsen2004Difficulty 57 (Graduate)
Subspeciation in the Meadow Mouse, Microtus montanus, in Wyoming and Colorado
Anderson, Sydney
423 Gutenberg downloadsen2010Difficulty 50 (College)
The Baculum in the Chipmunks of Western North America
White, John A.
423 Gutenberg downloadsen2010Difficulty 46 (College)
The Popular Science Monthly, June, 1900 Vol. 57, May, 1900 to October, 1900
Various
423 Gutenberg downloadsen2014Difficulty 69 (Academic)
Whale Primer, with Special Attention to the California Gray Whale
Walker, Theodore J.
423 Gutenberg downloadsen2019Difficulty 55 (Graduate)
Flowers and their friends
Morley, Margaret Warner
422 Gutenberg downloadsen2024Difficulty 39 (High School)
New West Indian Spiders Bulletin of the AMNH, Vol. XXXIII, Art. XLI, pp. 639-642
Banks, Nathan
422 Gutenberg downloadsen2010Difficulty 47 (College)
The Naturalist's Repository, Volume 1 (of 5) or Monthly Miscellany of Exotic Natural History: etc. etc.
Donovan, E. (Edward)
422 Gutenberg downloadsen2017Difficulty 76 (Expert)
Two New Pelycosaurs from the Lower Permian of Oklahoma
Fox, Richard C.
422 Gutenberg downloadsen2009Difficulty 59 (Graduate)
Zoological Illustrations, Second Series, Volume 1 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
422 Gutenberg downloadsen2013Difficulty 59 (Graduate)
Zoological Illustrations, Volume 2 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
422 Gutenberg downloadsen2012Difficulty 62 (Academic)
Atoms, Nature, and Man: Man-made Radioactivity in the Environment
Hines, Neal O.
421 Gutenberg downloadsen2015Difficulty 68 (Academic)
Facts and Arguments for Darwin
Müller, Fritz
421 Gutenberg downloadsen2004Difficulty 70 (Academic)
Lectures on Evolution Essay #3 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
421 Gutenberg downloadsen2001Difficulty 69 (Academic)
Scientific American Supplement, No. 303, October 22, 1881
Various
421 Gutenberg downloadsen2005Difficulty 52 (Graduate)
Studies of trees in winter : $b A description of the deciduous trees of northeastern America
Huntington, Annie Oakes
421 Gutenberg downloadsen2024Difficulty 51 (Graduate)
The micro-organisms of the soil
Russell, Edward J. (Edward John) & Rothamsted Experimental Station
421 Gutenberg downloadsen2022Difficulty 62 (Academic)
The Speech of Monkeys
Garner, R. L. (Richard Lynch)
421 Gutenberg downloadsen2010Difficulty 54 (Graduate)
Beautiful shells : $b Their nature, structure, and uses familiarly explained; with directions for collecting, cleaning, and arranging them in the cabinet; descriptions of the most remarkable species, and of the creatures which inhabit them; and explanations of the meanings of their scientific names, and of the terms used in conchology
Adams, H. G. (Henry Gardiner)
420 Gutenberg downloadsen2024Difficulty 66 (Academic)
Selected Records of Reptiles and Amphibians from Kansas
Breukelman, John & Smith, Hobart M. (Hobart Muir)
420 Gutenberg downloadsen2010Difficulty 47 (College)
La philosophie zoologique avant Darwin
Perrier, Edmond
419 Gutenberg downloadsfr2010
The Salmon Fishery of Penobscot Bay and River in 1895-96
Smith, Hugh M. (Hugh McCormick)
419 Gutenberg downloadsen2005Difficulty 48 (College)
Travels into North America, Volume 3 (of 3)
Kalm, Pehr
419 Gutenberg downloadsen2024Difficulty 50 (College)
Von Sonnen und Sonnenstäubchen : $b Kosmische Wanderungen
Bölsche, Wilhelm
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Keys to Fungi on Dung
Richardson, M. J. (Michael J.) & Watling, Roy
418 Gutenberg downloadsen2018Difficulty 57 (Graduate)
The Domestic Cat
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418 Gutenberg downloadsen2011Difficulty 51 (Graduate)
The Orchid Album, Volume 3 Comprising Coloured Figures and Descriptions of New, Rare, and Beautiful Orchidaceous Plants
Moore, Thomas
418 Gutenberg downloadsen2019Difficulty 57 (Graduate)
Thoughts on Religion
Romanes, George John
418 Gutenberg downloadsen2005Difficulty 72 (Expert)
Histoire naturelle des oiseaux d'Afrique, t. 1
Le Vaillant, François
417 Gutenberg downloadsfr2018
Morphological Variation in a Population of the Snake, Tantilla gracilis Baird and Girard
Hardy, Laurence M. & Cole, Charles J.
417 Gutenberg downloadsen2010Difficulty 55 (Graduate)
On the phenomena of variation and geographical distribution as illustrated by the Papilionidæ of the Malayan region
Wallace, Alfred Russel
417 Gutenberg downloadsen2024Difficulty 66 (Academic)
Palm trees of the Amazon and their uses
Wallace, Alfred Russel
417 Gutenberg downloadsen2023Difficulty 62 (Academic)
The illustrated story of evolution
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417 Gutenberg downloadsen2023Difficulty 54 (Graduate)
Bee Keeping
Benton, Frank
416 Gutenberg downloadsen2015Difficulty 63 (Academic)
Comments on the Taxonomy and Geographic Distribution of Some North American Rabbits
Hall, E. Raymond (Eugene Raymond) & Kelson, Keith R.
416 Gutenberg downloadsen2009Difficulty 58 (Graduate)
Descriptions of New Hylid Frogs From Mexico and Central America
Duellman, William Edward
416 Gutenberg downloadsen2010Difficulty 64 (Academic)
Subspeciation in Pocket Gophers of Kansas, [KU. Vol. 1 No. 11]
Villa Ramírez, Bernardo & Hall, E. Raymond (Eugene Raymond)
416 Gutenberg downloadsen2011Difficulty 58 (Graduate)
Half hours with the lower animals : $b protozoans, sponges, corals, shells, insects, and crustaceans
Holder, Charles Frederick
415 Gutenberg downloadsen2016Difficulty 51 (Graduate)
Illustrated Index of British Shells Containing figures of all the recent species
Sowerby, G. B. (George Brettingham)
415 Gutenberg downloadsen2013Difficulty 53 (Graduate)
A New Genus of Pennsylvanian Fish (Crossopterygii, Coelacanthiformes) from Kansas
Echols, Joan
414 Gutenberg downloadsen2010Difficulty 60 (Graduate)
An Expository Outline of the "Vestiges of the Natural History of Creation" With a Notice of the Author's "Explanations:" A Sequel to the Vestiges
Laing, S. (Samuel)
414 Gutenberg downloadsen2006Difficulty 66 (Academic)
Chambers's Journal of Popular Literature, Science, and Art, No. 683 January 27, 1877
Various
414 Gutenberg downloadsen2014Difficulty 50 (College)
North American Yellow Bats, 'Dasypterus,' and a List of the Named Kinds of the Genus Lasiurus Gray
Hall, E. Raymond (Eugene Raymond) & Jones, J. Knox
414 Gutenberg downloadsen2010Difficulty 59 (Graduate)
Records of the Fossil Mammal Sinclairella, Family Apatemyidae, From the Chadronian and Orellan
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414 Gutenberg downloadsen2009Difficulty 57 (Graduate)
The Birds of Australia, Vol. 2 of 7
Gould, John
414 Gutenberg downloadsen2019Difficulty 66 (Academic)
A Critical Examination of the Position of Mr. Darwin's Work, "On the Origin of Species," in Relation to the Complete Theory of the Causes of the Phenomena of Organic Nature Lecture VI. (of VI.), "Lectures to Working Men", at the Museum of Practical Geology, 1863, on Darwin's Work: "Origin of Species"
Huxley, Thomas Henry
413 Gutenberg downloadsen2001Difficulty 67 (Academic)
Beautiful Ferns
Eaton, Daniel Cady
413 Gutenberg downloadsen2014Difficulty 58 (Graduate)
Introduction to the Study of Palæontological Botany
Balfour, John Hutton
413 Gutenberg downloadsen2016Difficulty 55 (Graduate)
Poisonous Snakes of Kansas
Clarke, Robert F. (Robert Francis)
413 Gutenberg downloadsen2019Difficulty 50 (College)
Summer Birds From the Yucatan Peninsula, Mexico
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413 Gutenberg downloadsen2011Difficulty 52 (Graduate)
Texas Honey Plants
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413 Gutenberg downloadsen2012Difficulty 53 (Graduate)
The Brain and the Voice in Speech and Song
Mott, F. W. (Frederick Walker)
413 Gutenberg downloadsen2004Difficulty 68 (Academic)
The Philosophy Which Shows the Physiology of Mesmerism and Explains the Phenomenon of Clairvoyance
Pasley, T. H.
413 Gutenberg downloadsen2015Difficulty 74 (Expert)
Comments on the Taxonomy and Geographic Distribution of Some North American Rodents
Hall, E. Raymond (Eugene Raymond) & Kelson, Keith R.
412 Gutenberg downloadsen2010Difficulty 56 (Graduate)
George Washington Carver National Monument Junior Ranger Activity Book: The Scientist
United States. National Park Service
412 Gutenberg downloadsen2020Difficulty 49 (College)
Himalayan Journals — Volume 1 Or, Notes of a Naturalist in Bengal, the Sikkim and Nepal Himalayas, the Khasia Mountains, etc.
Hooker, Joseph Dalton
412 Gutenberg downloadsen2004Difficulty 74 (Expert)
Hormones and Heredity A Discussion of the Evolution of Adaptations and the Evolution of Species
Cunningham, J. T. (Joseph Thomas)
412 Gutenberg downloadsen2005Difficulty 73 (Expert)
Lamarck et son OEuvre
Corra, Emile
412 Gutenberg downloadsfr2012
The botanist's repository for new and rare plants; vol. 09 [of 10]
Andrews, Henry Cranke, active 1799-1828
412 Gutenberg downloadsen2024Difficulty 55 (Graduate)
Memorias sobre a influencia dos descobrimentos portuguezes no conhecimento das plantas I. - Memoria sobre a Malagueta
Ficalho, Francisco Manuel de Melo, Conde de
411 Gutenberg downloadspt2009
Roses: or, a Monograph of the Genus Rosa
Andrews, Henry Cranke, active 1799-1828
411 Gutenberg downloadsen2021Difficulty 63 (Academic)
The botanist's repository for new and rare plants; vol. 08 [of 10]
Andrews, Henry Cranke, active 1799-1828
411 Gutenberg downloadsen2024Difficulty 58 (Graduate)
A Bilateral Division of the Parietal Bone in a Chimpanzee; with a Special Reference to the Oblique Sutures in the Parietal
Hrdlička, Aleš
410 Gutenberg downloadsen2010Difficulty 65 (Academic)
De Wereld vóór de schepping van den mensch
Flammarion, Camille
410 Gutenberg downloadsnl2006
Grundriß der menschlichen Erblichkeitslehre und Rassenhygiene (1/2) Menschliche Erblichkeitslehre
Baur, Erwin & Fischer, Eugen & Lenz, Fritz
410 Gutenberg downloadsde2015
Het Leven der Dieren: Deel 1, Hoofdstuk 04: De Roofdieren
Brehm, Alfred Edmund
410 Gutenberg downloadsnl2006
An account of the manner of inoculating for the small pox in the East Indies With some observations on the practice and mode of treating that disease in those parts
Holwell, J. Z. (John Zephaniah)
409 Gutenberg downloadsen2016Difficulty 88 (Specialist)
Geographic Variation in the North American Cyprinid Fish, Hybopsis gracilis
Olund, Leonard J. & Cross, Frank B. (Frank Bernard)
409 Gutenberg downloadsen2011Difficulty 57 (Graduate)
Eugenics as a Factor in the Prevention of Mental Disease
Pollock, Horatio M. (Horatio Milo)
408 Gutenberg downloadsen2011Difficulty 65 (Academic)
Fish Populations, Following a Drought, in the Neosho and Marais des Cygnes Rivers of Kansas
Deacon, James E.
408 Gutenberg downloadsen2010Difficulty 52 (Graduate)
The zoology of the voyage of H.M.S. Beagle [vol. 3 of 5] : $b Birds
Gould, John
408 Gutenberg downloadsen2024Difficulty 54 (Graduate)
Darwin, and After Darwin, Volume 2 of 3 Post-Darwinian Questions: Heredity and Utility
Romanes, George John
407 Gutenberg downloadsen2011Difficulty 64 (Academic)
Humanity to Honey-Bees or, Practical Directions for the Management of Honey-Bees Upon an Improved and Humane Plan, by Which the Lives of Bees May Be Preserved, and Abundance of Honey of a Superior Quality May Be Obtained
Nutt, Thomas
407 Gutenberg downloadsen2018Difficulty 65 (Academic)
The Postnatal Development of Two Broods of Great Horned Owls (Bubo virginianus)
Hoffmeister, Donald Frederick & Setzer, Henry W.
407 Gutenberg downloadsen2011Difficulty 51 (Graduate)
A New Order of Fishlike Amphibia From the Pennsylvanian of Kansas
Eaton, Theodore H. (Theodore Hildreth) & Stewart, Peggy Lou
406 Gutenberg downloadsen2010Difficulty 55 (Graduate)
A New Pocket Gopher (Thomomys) and A New Spiny Pocket Mouse (Liomys) from Michoacán, Mexico
Hall, E. Raymond (Eugene Raymond) & Villa Ramírez, Bernardo
406 Gutenberg downloadsen2010Difficulty 60 (Graduate)
A Synopsis of the American Bats of the Genus Pipistrellus
Hall, E. Raymond (Eugene Raymond) & Dalquest, Walter Woelber
406 Gutenberg downloadsen2010Difficulty 58 (Graduate)
Daedalus : $b or, Science and the future
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406 Gutenberg downloadsen2023Difficulty 58 (Graduate)
Mammals of the Grand Mesa, Colorado
Anderson, Sydney
406 Gutenberg downloadsen2010Difficulty 51 (Graduate)
Seventeen Species of Bats Recorded from Barro Colorado Island, Panama Canal Zone
Hall, E. Raymond (Eugene Raymond) & Jackson, William B.
406 Gutenberg downloadsen2009Difficulty 48 (College)
Studies in the Theory of Descent, Volume II
Weismann, August
406 Gutenberg downloadsen2015Difficulty 65 (Academic)
A New Subspecies of the Black Myotis (Bat) from Eastern Mexico
Hall, E. Raymond (Eugene Raymond) & Alvarez, Ticul
405 Gutenberg downloadsen2008Difficulty 55 (Graduate)
Mammals Obtained by Dr. Curt von Wedel from the Barrier Beach of Tamaulipas, Mexico
Hall, E. Raymond (Eugene Raymond)
405 Gutenberg downloadsen2009Difficulty 53 (Graduate)
Pipistrellus cinnamomeus Miller 1902 Referred to the Genus Myotis
Hall, E. Raymond (Eugene Raymond) & Dalquest, Walter Woelber
405 Gutenberg downloadsen2010Difficulty 55 (Graduate)
Scientific American Supplement, No. 286, June 25, 1881
Various
405 Gutenberg downloadsen2005Difficulty 53 (Graduate)
Scientific American Supplement, No. 417, December 29, 1883
Various
405 Gutenberg downloadsen2005Difficulty 65 (Academic)
A Discourse on the Plague
Mead, Richard
404 Gutenberg downloadsen2010Difficulty 61 (Academic)
Birds and Nature Vol. 09 No. 3 [March 1901]
Various
404 Gutenberg downloadsen2014Difficulty 54 (Graduate)
Botanical features of the Algerian Sahara
Cannon, William Austin
404 Gutenberg downloadsen2023Difficulty 52 (Graduate)
Geographic Range of the Hooded Skunk, Mephitis macroura With Description of a New Subspecies from Mexico
Hall, E. Raymond (Eugene Raymond) & Dalquest, Walter Woelber
404 Gutenberg downloadsen2010Difficulty 57 (Graduate)
Yeast
Huxley, Thomas Henry
404 Gutenberg downloadsen2001Difficulty 66 (Academic)
An Examination of Weismannism
Romanes, George John
403 Gutenberg downloadsen2015Difficulty 74 (Expert)
Der Unterkiefer des Homo Heidelbergensis: Aus den Sanden von Mauer bei Heidelberg
Schoetensack, Otto
403 Gutenberg downloadsde2011
Popular Lectures on Zoonomia Or The Laws of Animal Life, in Health and Disease
Garnett, Thomas
403 Gutenberg downloadsen2009Difficulty 59 (Graduate)
Studies in Spermatogenesis (Part 2 of 2)
Stevens, N. M. (Nettie Maria)
403 Gutenberg downloadsen2010Difficulty 58 (Graduate)
The Science of Animal Locomotion (Zoopraxography) An Electro-Photographic Investigation of Consecutive Phases of Animal Movements
Muybridge, Eadweard
403 Gutenberg downloadsen2012Difficulty 64 (Academic)
Evolution and Adaptation
Morgan, Thomas Hunt
401 Gutenberg downloadsen2020Difficulty 62 (Academic)
Plague Its Cause and the Manner of its Extension, Its Menace, Its Control and Suppression, Its Diagnosis and Treatment
Jackson, Thomas Wright
401 Gutenberg downloadsen2013Difficulty 68 (Academic)
The Ancestry of Modern Amphibia: A Review of the Evidence
Eaton, Theodore H. (Theodore Hildreth)
401 Gutenberg downloadsen2011Difficulty 69 (Academic)
The Coal Measures Amphibia of North America
Moodie, Roy Lee
401 Gutenberg downloadsen2019Difficulty 62 (Academic)
Practical Skunk Raising A Book of Information Concerning the Raising of Skunks for Profit
Pratt, William Edwin
400 Gutenberg downloadsen2014Difficulty 40 (High School)
Foreign Butterflies
Duncan, James
399 Gutenberg downloadsen2018Difficulty 56 (Graduate)
Journal of Entomology and Zoology, Vol. 09, No. 1, March 1917
Various
399 Gutenberg downloadsen2015Difficulty 53 (Graduate)
The Philosophy of Evolution Together With a Preliminary Essay on The Metaphysical Basis of Science
Carpenter, Stephen H. (Stephen Haskins)
399 Gutenberg downloadsen2009Difficulty 64 (Academic)
Insect manufactures
Anonymous
398 Gutenberg downloadsen2024Difficulty 60 (Graduate)
On the Method of Zadig Essay #1 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
398 Gutenberg downloadsen2001Difficulty 66 (Academic)
The Present Method of Inoculating for the Small-Pox To which are added, some experiments, instituted with a view to discover the effects of a similar treatment in the natural small-pox
Dimsdale, Thomas
398 Gutenberg downloadsen2015Difficulty 68 (Academic)
Geographic Variation in the Pocket Gopher, Cratogeomys castanops, in Coahuila, México
Russell, Robert J. & Baker, Rollin H. (Rollin Harold)
397 Gutenberg downloadsen2010Difficulty 64 (Academic)
Ilex cassine, the aboriginal North American tea $b Its history, distribution, and use among the native North American Indians
Hale, Edwin M. (Edwin Moses)
397 Gutenberg downloadsen2023Difficulty 52 (Graduate)
Thoracic and Coracoid Arteries In Two Families of Birds, Columbidae and Hirundinidae
Jenkinson, Marion Anne
397 Gutenberg downloadsen2010Difficulty 64 (Academic)
Ohio Biological Survey, Bull. 10, Vol. 11, No. 6 The Ascomycetes of Ohio IV and V
Fink, Bruce & Hilker, Leafy Jane Corrington
396 Gutenberg downloadsen2006Difficulty 58 (Graduate)
Scientific Essays and Lectures
Kingsley, Charles
396 Gutenberg downloadsen2003Difficulty 56 (Graduate)
The Birds of Australia, Vol. 3 of 7
Gould, John
396 Gutenberg downloadsen2019Difficulty 61 (Academic)
The Methods and Scope of Genetics An inaugural lecture delivered 23 October 1908
Bateson, William
396 Gutenberg downloadsen2016Difficulty 60 (Graduate)
A New Name for the Mexican Red Bat
Hall, E. Raymond (Eugene Raymond)
394 Gutenberg downloadsen2007Difficulty 55 (Graduate)
Natur und Mensch Sechs Abschnitte aus Werken von Ernst Haeckel
Haeckel, Ernst
394 Gutenberg downloadsde2015
The Baculum in Microtine Rodents
Anderson, Sydney
394 Gutenberg downloadsen2011Difficulty 64 (Academic)
Description of a New Softshell Turtle from the Southeastern United States
Webb, Robert G. (Robert Gravem)
393 Gutenberg downloadsen2010Difficulty 60 (Graduate)
Hybridization Between Two Species of Garter Snakes
Smith, Hobart M. (Hobart Muir)
393 Gutenberg downloadsen2011Difficulty 57 (Graduate)
On Some Fossil Remains of Man
Huxley, Thomas Henry
393 Gutenberg downloadsen2001Difficulty 60 (Graduate)
Descriptions of Three New Birds from the Belgian Congo Bulletin of the AMNH , Vol. XXXIV, Art. XVI, pp. 509-513, Oct. 20th, 1915
Chapin, James Paul
392 Gutenberg downloadsen2010Difficulty 49 (College)
Five Natural Hybrid Combinations in Minnows (Cyprinidae)
Cross, Frank B. (Frank Bernard) & Minckley, W. L.
392 Gutenberg downloadsen2011Difficulty 56 (Graduate)
The chocolate-plant (Theobroma cacao) and its products
Anonymous
392 Gutenberg downloadsen2025Difficulty 55 (Graduate)
Über die Entstehung der Arten im Thier- und Pflanzen-Reich durch natürliche Züchtung
Darwin, Charles
392 Gutenberg downloadsde2022
A New Species of Frog (Genus Tomodactylus) from Western México
Webb, Robert G. (Robert Gravem)
391 Gutenberg downloadsen2010Difficulty 62 (Academic)
Cranial Osteology of the Hylid Frog, Smilisca baudini
Trueb, Linda
391 Gutenberg downloadsen2010Difficulty 61 (Academic)
Natural History of the Brush Mouse (Peromyscus boylii) in Kansas With Description of a New Subspecies
Long, Charles Alan
391 Gutenberg downloadsen2010Difficulty 51 (Graduate)
The Christian Foundation, Or, Scientific and Religious Journal, Volume 1, Index, 1880
Various
391 Gutenberg downloadsen2009Difficulty 77 (Expert)
Two New Meadow Mice from Michoacán Mexico
Hall, E. Raymond (Eugene Raymond)
391 Gutenberg downloadsen2010Difficulty 60 (Graduate)
Cruise of the Revenue-Steamer Corwin in Alaska and the N.W. Arctic Ocean in 1881: Botanical Notes Notes and Memoranda: Medical and Anthropological; Botanical; Ornithological.
Muir, John
390 Gutenberg downloadsen2010Difficulty 54 (Graduate)
Biology versus Theology. The Bible: irreconcilable with Science, Experience, and even its own statements
Julian
389 Gutenberg downloadsen2021Difficulty 52 (Graduate)
Notes on Philippine Birds Collected by Governor W. Cameron Forbes Bulletin of the Museum of Comparative Zoölogy at Harvard College, Vol. LXV. No. 4.
Bangs, Outram
389 Gutenberg downloadsen2011Difficulty 49 (College)
Scientific American Supplement, No. 358, November 11, 1882
Various
389 Gutenberg downloadsen2005Difficulty 61 (Academic)
Scientific American Supplement, No. 388, June 9, 1883
Various
389 Gutenberg downloadsen2005Difficulty 56 (Graduate)
Use of the Dead to the Living
Smith, Southwood
389 Gutenberg downloadsen2018Difficulty 67 (Academic)
Descriptions of Two Species of Frogs, Genus Ptychohyla Studies of American Hylid Frogs, V
Duellman, William Edward
388 Gutenberg downloadsen2010Difficulty 59 (Graduate)
Section Cutting and Staining A practical introduction to histological methods for students and practitioners
Colman, Walter S.
388 Gutenberg downloadsen2016Difficulty 50 (College)
A New Subspecies of Pocket Mouse from Kansas
Hall, E. Raymond (Eugene Raymond)
387 Gutenberg downloadsen2010Difficulty 57 (Graduate)
The Periodical Cicada, "the 17-year Locust"
United States. Department of Agriculture
386 Gutenberg downloadsen2019Difficulty 51 (Graduate)
Het Leven der Dieren. Derde Deel, Hoofdstuk 1 tot 4, De Kruipende Dieren
Brehm, Alfred Edmund
385 Gutenberg downloadsnl2014
Memoir on the Dodo (Didus ineptus, Linn.)
Owen, Richard
385 Gutenberg downloadsen2025Difficulty 57 (Graduate)
Natural History of the Salamander, Aneides hardii
Johnston, Richard F. & Schad, G. A.
385 Gutenberg downloadsen2010Difficulty 59 (Graduate)
New England Salmon Hatcheries and Salmon Fisheries in the Late 19th Century
Various
385 Gutenberg downloadsen2005Difficulty 53 (Graduate)
Bacteria in Daily Life
Frankland, Grace C.
384 Gutenberg downloadsen2013Difficulty 81 (Specialist)
Profitable poultry : $b Their management in health and disease
Tegetmeier, W. B. (William Bernhard)
384 Gutenberg downloadsen2024Difficulty 65 (Academic)
The Conditions of Existence as Affecting the Perpetuation of Living Beings Lecture V. (of VI.), "Lectures to Working Men", at the Museum of Practical Geology, 1863, on Darwin's Work: "Origin of Species"
Huxley, Thomas Henry
384 Gutenberg downloadsen2001Difficulty 64 (Academic)
The English moths and butterflies : $b Together with the plants, flowers, and fruits whereon they feed, and are usually found.
Wilkes, Benjamin
384 Gutenberg downloadsen2024Difficulty 58 (Graduate)
Reise in die Aequinoctial-Gegenden des neuen Continents. Band 4.
Humboldt, Alexander von
383 Gutenberg downloadsde2012
Zeugnisse für die Stellung des Menschen in der Natur
Huxley, Thomas Henry
383 Gutenberg downloadsde2010
A Monograph of the Trilobites of North America: with Coloured Models of the Species
Green, Jacob
382 Gutenberg downloadsen2021Difficulty 63 (Academic)
De la télépathie: Étude sur la transmission de la pensée
Hureau, Émile
382 Gutenberg downloadsfr2006
Q. E. D., or New Light on the Doctrine of Creation
Price, George McCready
382 Gutenberg downloadsen2004Difficulty 67 (Academic)
A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope
Lynch, John D.
381 Gutenberg downloadsen2011Difficulty 64 (Academic)
Het Leven der Dieren: Deel 2, Hoofdstuk 01: De Boomvogels.
Brehm, Alfred Edmund
381 Gutenberg downloadsnl2009
Mammals Collected by Dr. W. L. Abbott on the Natuna Islands Proceedings of the Washington Academy of Sciences, Vol. III, pp. 111-138
Miller, Gerrit S. (Gerrit Smith)
381 Gutenberg downloadsen2014Difficulty 54 (Graduate)
Our Summer Migrants An Account of the Migratory Birds Which Pass the Summer in the British Islands.
Harting, James Edmund
381 Gutenberg downloadsen2019Difficulty 57 (Graduate)
The Protection of Fresh-Water Mussels
Coker, R. E. (Robert Ervin)
381 Gutenberg downloadsen2013Difficulty 65 (Academic)
The puzzle of life and how it has been put together : $b A short history of the formation of the earth, with its vegetable and animal life, from the earliest times, including an account of prehistoric man, his weapons, tools, and works
Nicols, Arthur
381 Gutenberg downloadsen2025Difficulty 49 (College)
Journal of Entomology and Zoology, Vol. 11, No. 4, December 1919
Various
380 Gutenberg downloadsen2011Difficulty 54 (Graduate)
Le Tour du Monde; Voyage d'un naturaliste. Journal des voyages et des voyageurs; 2. sem. 1860
Various
380 Gutenberg downloadsfr2008
A Synopsis of Neotropical Hylid Frogs, Genus Osteocephalus
Trueb, Linda & Duellman, William Edward
379 Gutenberg downloadsen2011Difficulty 67 (Academic)
Die Zelle
Kahn, Fritz
379 Gutenberg downloadsde2012
Experimentelle Untersuchungen über die Frage »Ist die Furcht vor Krankheitsübertragung durch das Telephon berechtigt«? Inaugural-Dissertation zur Erlangung der Doktorwürde in der Medizin, Chirurgie und Geburtshülfe der Hohen Medizinischen Fakultät der Königlichen Universität Greifswald
Weiss, Carl
379 Gutenberg downloadsde2008
Journal of Entomology and Zoology, Vol. 06, No. 4, December 1914
Various
379 Gutenberg downloadsen2015Difficulty 53 (Graduate)
The Evolution of Man Scientifically Disproved in 50 Arguments
Williams, William A. (William Asbury)
379 Gutenberg downloadsen2005Difficulty 55 (Graduate)
A Check-List of the Birds of Idaho
Arvey, M. Dale (Martin Dale)
378 Gutenberg downloadsen2011Difficulty 55 (Graduate)
Note on the Resemblances and Differences in the Structure and the Development of the Brain in Man and Apes
Huxley, Thomas Henry & Darwin, Charles
378 Gutenberg downloadsen2000Difficulty 66 (Academic)
Scientific American Supplement, No. 829, November 21, 1891
Various
378 Gutenberg downloadsen2005Difficulty 63 (Academic)
The Factors of Organic Evolution
Spencer, Herbert
378 Gutenberg downloadsen2016Difficulty 70 (Academic)
Ecology of the Opossum on a Natural Area in Northeastern Kansas
Fitch, Henry S. (Henry Sheldon) & Sandidge, Lewis L.
376 Gutenberg downloadsen2011Difficulty 62 (Academic)
El Campesino Puertorriqueño Sus Condiciones Físicas, Intelectuales y Morales, Causas que la Determinan y Medios Para Mejorarlas
Valle Atiles, Francisco del
376 Gutenberg downloadses2015
Genera of Leptodactylid Frogs in México
Lynch, John D.
376 Gutenberg downloadsen2010Difficulty 74 (Expert)
The Body at Work: A Treatise on the Principles of Physiology
Hill, Alex
375 Gutenberg downloadsen2020Difficulty 54 (Graduate)
The house we live in : $b or, The making of the body
Farnsworth, Vesta J.
375 Gutenberg downloadsen2021Difficulty 31 (High School)
Zoological Illustrations, Second Series, Volume 3 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
375 Gutenberg downloadsen2013Difficulty 61 (Academic)
Het Leven der Dieren: Hoofdstuk 7: De Pluviervogels
Brehm, Alfred Edmund
374 Gutenberg downloadsnl2010
Links With the Past in the Plant World
Seward, A. C. (Albert Charles)
374 Gutenberg downloadsen2020Difficulty 65 (Academic)
Memoria sobre a cultura da Urumbeba e sobre criação da Cochonilha
Thiéry de Menonville, Nicolas-Joseph & Berthollet, Claude-Louis & Velloso, José Mariano da Conceição
374 Gutenberg downloadspt2012
Evolution
Watson, James A. S. (James Anderson Scott)
373 Gutenberg downloadsen2016Difficulty 60 (Graduate)
New Subspecies of the Rodent Baiomys from Central America University of Kansas Publications, Museum of Natural History
Packard, Robert L. (Robert Lewis)
373 Gutenberg downloadsen2012Difficulty 62 (Academic)
The Perpetuation of Living Beings, Hereditary Transmission and Variation Lecture IV. (of VI.), "Lectures to Working Men", at the Museum of Practical Geology, 1863, on Darwin's Work: "Origin of Species"
Huxley, Thomas Henry
373 Gutenberg downloadsen2001Difficulty 66 (Academic)
Coyotes in Their Economic Relations
Lantz, David E. (David Ernest)
372 Gutenberg downloadsen2014Difficulty 54 (Graduate)
The Darwinian Hypothesis
Huxley, Thomas Henry
372 Gutenberg downloadsen2001Difficulty 69 (Academic)
A Mechanical Account of Poisons in Several Essays
Mead, Richard
371 Gutenberg downloadsen2016Difficulty 73 (Expert)
A New Pocket Gopher (Genus Thomomys) From Wyoming and Colorado
Hall, E. Raymond (Eugene Raymond)
371 Gutenberg downloadsen2010Difficulty 51 (Graduate)
Den Waaragtigen Omloop des Bloeds
Leeuwenhoek, Antoni van
371 Gutenberg downloadsnl2006
Description of a New Vespertilionine Bat from Yucatan Author's Edition, extracted from Bulletin of the American Museum of Natural History, Vol. IX, September 28, 1897
Allen, J. A. (Joel Asaph)
371 Gutenberg downloadsen2008Difficulty 53 (Graduate)
Proceedings of the California Academy of Sciences, Series 3, Volume 4 (Zoology)
Various
371 Gutenberg downloadsen2017Difficulty 70 (Academic)
Systematic Status of the Colubrid Snake, Leptodeira discolor Günther
Duellman, William Edward
371 Gutenberg downloadsen2011Difficulty 62 (Academic)
Adequate Preparation for the Teacher of Biological Sciences in Secondary Schools
McDonald, J. Daley (James Daley)
370 Gutenberg downloadsen2010Difficulty 64 (Academic)
Humboldt From 'The Gods and Other Lectures'
Ingersoll, Robert Green
370 Gutenberg downloadsen2011Difficulty 62 (Academic)
Preliminary Survey of a Paleocene Faunule from the Angels Peak Area, New Mexico
Wilson, Robert W. (Robert Warren)
370 Gutenberg downloadsen2010Difficulty 62 (Academic)
The botanist's repository for new and rare plants; vol. 05 [of 10]
Andrews, Henry Cranke, active 1799-1828
370 Gutenberg downloadsen2024Difficulty 55 (Graduate)
Ants and Some Other Insects: An Inquiry Into the Psychic Powers of These Animals
Forel, Auguste
369 Gutenberg downloadsen2016Difficulty 70 (Academic)
Epidemic Respiratory Disease The pneumonias and other infections of the repiratory tract accompanying influenza and measles
Opie, Eugene L. (Eugene Lindsay) & Blake, Francis G. (Francis Gilman) & Rivers, Thomas M. (Thomas Milton) & Small, James C. (James Craig)
369 Gutenberg downloadsen2020Difficulty 67 (Academic)
The Rise and Progress of Palaeontology Essay #2 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
369 Gutenberg downloadsen2001Difficulty 77 (Expert)
A New Bat (Genus Myotis) From Mexico
Dalquest, Walter Woelber & Hall, E. Raymond (Eugene Raymond)
368 Gutenberg downloadsen2010Difficulty 57 (Graduate)
Bee-keeping for profit
Morley, W. S.
368 Gutenberg downloadsen2022Difficulty 53 (Graduate)
Breves instrucções aos correspondentes da Academia das Sciencias de Lisboa sobre as remessas dos productos, e noticias pertencentes a' Historia da Natureza, para formar hum Museo Nacional
Unknown
368 Gutenberg downloadspt2005
De honig en zijn gebruik
Rondou, W.-F.
368 Gutenberg downloadsnl2008
Descripción Geografica, Histórica y Estadística de Bolivia, Tomo 1.
Orbigny, Alcide Dessalines d'
368 Gutenberg downloadses2004
International Weekly Miscellany of Literature, Art and Science — Volume 1, No. 2, July 8, 1850
Various
368 Gutenberg downloadsen2004Difficulty 59 (Graduate)
The History of Esculent Fish
North, Roger
368 Gutenberg downloadsen2021Difficulty 47 (College)
A New Tortoise, Genus Gopherus, From North-central Mexico
Legler, John M.
367 Gutenberg downloadsen2010Difficulty 62 (Academic)
Epidemics Examined and Explained: or, Living Germs Proved by Analogy to be a Source of Disease
Grove, John
367 Gutenberg downloadsen2010Difficulty 65 (Academic)
Scientific American Supplement, No. 344, August 5, 1882
Various
367 Gutenberg downloadsen2005Difficulty 54 (Graduate)
Two New Moles (Genus Scalopus) from Mexico and Texas
Baker, Rollin H. (Rollin Harold)
367 Gutenberg downloadsen2010Difficulty 56 (Graduate)
A Dissertation on Horses Wherein It is Demonstrated, by Matters of Fact, as Well as from the Principles of Philosophy, That Innate Qualities Do Not Exist, and That the Excellence of This Animal is Altogether Mechanical and Not in the Blood
Osmer, William
366 Gutenberg downloadsen2004Difficulty 64 (Academic)
Die Naturwissenschaften in ihrer Entwicklung und in ihrem Zusammenhange, III. Band Das Emporblühen der modernen Naturwissenschaften bis zur Entdeckung des Energieprinzipes
Dannemann, Friedrich
366 Gutenberg downloadsde2018
Journal of Entomology and Zoology, Vol. 11, No. 1, March 1919
Various
366 Gutenberg downloadsen2014Difficulty 62 (Academic)
On the Variation of Species, with Especial Reference to the Insecta Followed by an Inquiry into the Nature of Genera
Wollaston, Thomas Vernon
366 Gutenberg downloadsen2012Difficulty 78 (Expert)
The Philosophy of Health; Volume 1 (of 2) or, an exposition of the physical and mental constitution of man
Smith, Southwood
366 Gutenberg downloadsen2019Difficulty 73 (Expert)
Contagious Abortion of Cows
MacNeal, Ward J.
365 Gutenberg downloadsen2011Difficulty 66 (Academic)
Distribution of Some Nebraskan Mammals
Jones, J. Knox
365 Gutenberg downloadsen2010Difficulty 54 (Graduate)
Some Common Birds in Their Relation to Agriculture
Beal, F. E. L. (Foster Ellenborough Lascelles)
365 Gutenberg downloadsen2020Difficulty 55 (Graduate)
The Interpreters of Genesis and the Interpreters of Nature Essay #4 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
365 Gutenberg downloadsen2001Difficulty 65 (Academic)
A Quantitative Study of the Nocturnal Migration of Birds
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364 Gutenberg downloadsen2011Difficulty 55 (Graduate)
Dans la Haute-Gambie : $b Voyage d'exploration scientifique, 1891-1892
Rançon, A. (André)
364 Gutenberg downloadsfr2024
Darwin, and After Darwin, Volume 3 of 3 Post-Darwinian Questions: Isolation and Physiological Selection
Romanes, George John
364 Gutenberg downloadsen2011Difficulty 66 (Academic)
Rust, Smut, Mildew, & Mould: An Introduction to the Study of Microscopic Fungi
Cooke, M. C. (Mordecai Cubitt)
364 Gutenberg downloadsen2020Difficulty 61 (Academic)
The Bedbug [1916]
Marlatt, C. L.
364 Gutenberg downloadsen2020Difficulty 61 (Academic)
The philosophy of biology
Johnstone, James
364 Gutenberg downloadsen2020Difficulty 65 (Academic)
A New Subspecies of Slider Turtle (Pseudemys scripta) from Coahuila, México
Legler, John M.
363 Gutenberg downloadsen2010Difficulty 60 (Graduate)
An Annotated Checklist of Nebraskan Bats
Webb, Olin L. & Jones, J. Knox
363 Gutenberg downloadsen2010Difficulty 55 (Graduate)
Bees from British Guiana Bulletin of the AMNH, Vol. XXXVIII, Art. XX, pp. 685-690
Cockerell, Theodore D. A. (Theodore Dru Alison)
363 Gutenberg downloadsen2010Difficulty 55 (Graduate)
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Lankester, E. Ray (Edwin Ray), Sir
363 Gutenberg downloadsen2020Difficulty 50 (College)
Het Leven der Dieren: Deel 1, Hoofdstuk 14: Buideldieren; Hoofdstuk 15: Kloakdieren
Brehm, Alfred Edmund
363 Gutenberg downloadsnl2007
Observations on the Oleum Jecoris Aselli, or Cod-liver Oil Its nature, properties, mode of preparation, &c.
Savory, John
363 Gutenberg downloadsen2021Difficulty 70 (Academic)
On The Affinities of Leptarctus primus of Leidy American Museum of Natural History, Vol. VI, Article VIII, pp. 229-331.
Wortman, Jacob Lawson
363 Gutenberg downloadsen2008Difficulty 54 (Graduate)
Taxonomic Notes on Mexican Bats of the Genus Rhogeëssa
Hall, E. Raymond (Eugene Raymond)
363 Gutenberg downloadsen2010Difficulty 50 (College)
The Past Condition of Organic Nature Lecture II. (of VI.), "Lectures to Working Men", at the Museum of Practical Geology, 1863, on Darwin's Work: "Origin of Species"
Huxley, Thomas Henry
363 Gutenberg downloadsen2001Difficulty 65 (Academic)
The run
Hay, John
363 Gutenberg downloadsen2025Difficulty 48 (College)
A New Subspecies of Microtus montanus from Montana and Comments on Microtus canicaudus Miller
Hall, E. Raymond (Eugene Raymond) & Kelson, Keith R.
362 Gutenberg downloadsen2009Difficulty 58 (Graduate)
Het Leven der Dieren: Deel 1, Hoofdstuk 11: De Evenvingerigen
Brehm, Alfred Edmund
362 Gutenberg downloadsnl2007
Supplement to the catalogue of seals and whales in the British Museum
Gray, John Edward
362 Gutenberg downloadsen2023Difficulty 45 (College)
The plurality of the human race
Pouchet, G. (Georges)
362 Gutenberg downloadsen2023Difficulty 61 (Academic)
The ethics of Hercules : $b A study of man's body as the sole determinant of ethical values
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361 Gutenberg downloadsen2023Difficulty 63 (Academic)
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361 Gutenberg downloadsen2005Difficulty 58 (Graduate)
Degeneration: A Chapter in Darwinism
Lankester, E. Ray (Edwin Ray), Sir
360 Gutenberg downloadsen2019Difficulty 66 (Academic)
The American Bee Journal, Volume VI, Number 3, September 1870
Various
360 Gutenberg downloadsen2018Difficulty 56 (Graduate)
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360 Gutenberg downloadsen2024Difficulty 57 (Graduate)
The Italian Alp-bee; or, The gold mine of husbandry short and practical instructions to breed genuine prolific Italian queens; to multiply them by hundreds in a few months and how to change German hives into Italian
Hermann, H. C. (Heinrich C.)
360 Gutenberg downloadsen2023Difficulty 51 (Graduate)
Kyphosis and other Variations in Soft-shelled Turtles
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359 Gutenberg downloadsen2010Difficulty 46 (College)
A mechanical and critical enquiry into the nature of hermaphrodites
Parsons, James
358 Gutenberg downloadsen2023Difficulty 62 (Academic)
Records of Harvest Mice, Reithrodontomys, from Central America, with Description of a New Subspecies from Nicaragua
Anderson, Sydney & Jones, J. Knox
358 Gutenberg downloadsen2010Difficulty 55 (Graduate)
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Anonymous
358 Gutenberg downloadspt2006
The attitudes of animals in motion, illustrated with the zoopraxiscope
Muybridge, Eadweard
358 Gutenberg downloadsen2011Difficulty 59 (Graduate)
The Subspecies of the Mexican Red-Bellied Squirrel, Sciurus aureogaster
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358 Gutenberg downloadsen2010Difficulty 61 (Academic)
Het Leven der Dieren: Deel 2, Hoofdstuk 05: De Ralvogels; Hoofdstuk 06: De Kraanvogels
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357 Gutenberg downloadsnl2009
Improved Queen-Rearing; or, How to Rear Large, Prolific, Long-Lived Queen Bees The Result of Nearly Half a Century's Experience in Rearing Queen Bees, Giving the Practical, Every-day Work of the Queen-Rearing Apiary
Alley, Henry
357 Gutenberg downloadsen2019Difficulty 48 (College)
Neotropical Bats from Western México
Anderson, Sydney
357 Gutenberg downloadsen2010Difficulty 53 (Graduate)
Poultry diseases Causes, symptoms and treatment, with notes on post-mortem examinations
Wortley, E. J. (E. Jocelyn)
357 Gutenberg downloadsen2022Difficulty 57 (Graduate)
A Synopsis of the British Mosses Containing Descriptions of All the Genera and Species, (With Localities of the Rarer Ones) Found in Great Britain and Ireland, Based Upon Wilson's "Bryologia Britannica," Schimper's "Synopsis," Etc.
Hobkirk, Charles C. P. (Charles Codrington Pressick)
356 Gutenberg downloadsen2021Difficulty 63 (Academic)
Bananas: Nature's Institution for the Promotion of Laziness
Perry, Edward Wilkin
356 Gutenberg downloadsen2017Difficulty 52 (Graduate)
Beginselen der dierkunde
Ritzema Bos, J. (Jan)
356 Gutenberg downloadsnl2010
Coloured engravings of heaths; vol. 1
Andrews, Henry Cranke, active 1799-1828
356 Gutenberg downloadsen2023Difficulty 60 (Graduate)
Researches on the Visual Organs of the Trilobites
Lindström, Gustaf
356 Gutenberg downloadsen2022Difficulty 54 (Graduate)
Self-Organizing Systems, 1963
Unknown
356 Gutenberg downloadsen2021Difficulty 72 (Expert)
The Kansas University Quarterly, Vol. I, No. 1 (1892)
Various
356 Gutenberg downloadsen2017Difficulty 58 (Graduate)
Treatise on the Anatomy and Physiology of the Mucous Membranes With Illustrative Pathological Observations
Bichat, Xavier
356 Gutenberg downloadsen2016Difficulty 67 (Academic)
Comments on the Taxonomic Status of Apodemus peninsulae, with Description of a New Subspecies from North China
Jones, J. Knox
355 Gutenberg downloadsen2010Difficulty 62 (Academic)
The Mammals of Warren Woods, Berrien County, Michigan Occasional Paper of the Museum of Zoology, Number 86
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355 Gutenberg downloadsen2010Difficulty 49 (College)
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Taylor, Edward Harrison
354 Gutenberg downloadsen2010Difficulty 62 (Academic)
Sphinx Vespiformis: An Essay
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354 Gutenberg downloadsen2013Difficulty 73 (Expert)
The Virtue and Use of Coffee With Regard to the Plague and Other Infectious Distempers
Bradley, Richard
354 Gutenberg downloadsen2019Difficulty 63 (Academic)
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353 Gutenberg downloadsen2015Difficulty 56 (Graduate)
Conspecificity of two pocket mice, Perognathus goldmani and P. artus
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353 Gutenberg downloadsen2010Difficulty 53 (Graduate)
Louis Agassiz as a Teacher; illustrative extracts on his method of instruction
Cooper, Lane
353 Gutenberg downloadsen2004Difficulty 56 (Graduate)
De afstamming van den mensch en de seksueele teeltkeus, deel 2 (van 2)
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352 Gutenberg downloadsnl2024
The Botanical Magazine, Vol. 10 Or, Flower-Garden Displayed
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352 Gutenberg downloadsen2020Difficulty 57 (Graduate)
The Systematic Status of Eumeces pluvialis Cope
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351 Gutenberg downloadsen2011Difficulty 60 (Graduate)
Μικρά Φυσικά, Τόμος Δεύτερος
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351 Gutenberg downloadsel2009
A New Long-eared Myotis (Myotis evotis) From Northeastern Mexico
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350 Gutenberg downloadsen2010Difficulty 54 (Graduate)
Some Common Birds Useful to the Farmer (1926 edition)
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350 Gutenberg downloadsen2020Difficulty 55 (Graduate)
The Method by Which the Causes of the Present and Past Conditions of Organic Nature Are to Be Discovered; the Origination of Living Beings Lecture III. (of VI.), "Lectures to Working Men", at the Museum of Practical Geology, 1863, on Darwin's Work: "Origin of Species"
Huxley, Thomas Henry
350 Gutenberg downloadsen2001Difficulty 61 (Academic)
The modes of origin of lowest organisms including a discussion of the experiments of M. Pasteur
Bastian, H. Charlton
350 Gutenberg downloadsen2015Difficulty 71 (Expert)
A New Subspecies of the Fruit-eating Bat, Sturnira ludovici, From Western Mexico
Jones, J. Knox & Phillips, Gary L.
348 Gutenberg downloadsen2010Difficulty 55 (Graduate)
Emanuel Swedenborg's Investigations in Natural Science and the Basis for His Statements Concerning the Functions of the Brain
Ramström, Martin
348 Gutenberg downloadsen2020Difficulty 71 (Expert)
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Maeterlinck, Maurice
348 Gutenberg downloadsfr2024
Notes on Veterinary Anatomy
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348 Gutenberg downloadsen2019Difficulty 53 (Graduate)
Polarforskningen
Nathorst, A. G. (Alfred Gabriel)
348 Gutenberg downloadssv2009
Report on the Migration of Birds in the Spring and Autumn of 1886. Eighth Report (Vol. II, No. 3.)
Harvie-Brown, J. A. (John Alexander) & Barrington, Richard Manliffe & Clarke, William Eagle & Cordeaux, John & More, Alexander Goodman
348 Gutenberg downloadsen2021Difficulty 43 (College)
Mammals from Tamaulipas, Mexico
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347 Gutenberg downloadsen2010Difficulty 55 (Graduate)
Pliocene and Pleistocene Records of Fossil Turtles from Western Kansas and Oklahoma University of Kansas Publications Museum of Natural History Volume 1
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347 Gutenberg downloadsen2010Difficulty 60 (Graduate)
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346 Gutenberg downloadsen2010Difficulty 63 (Academic)
Geographic Variation in Red-backed Mice (Genus Clethrionomys) of the Southern Rocky Mountain Region
Cockrum, E. Lendell & Fitch, Kenneth Leonard
346 Gutenberg downloadsen2010Difficulty 53 (Graduate)
The flowering plants of South Africa; vol. 4
Pole Evans, I. B. (Illtyd Buller)
346 Gutenberg downloadsen2023Difficulty 49 (College)
Notes on the Mammals of Gogebic and Ontonagon Counties, Michigan, 1920 Occasional Papers of the Museum of Zoology, Number 109
Dice, Lee R. (Lee Raymond) & Sherman, Harley Bakwel
345 Gutenberg downloadsen2011Difficulty 54 (Graduate)
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Duellman, William Edward & Berg, Barbara
345 Gutenberg downloadsen2024Difficulty 56 (Graduate)
A New Bat (Genus Pipistrellus) from Northeastern Mexico
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344 Gutenberg downloadsen2010Difficulty 57 (Graduate)
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Brehm, Alfred Edmund
344 Gutenberg downloadsnl2007
The Ohio naturalist, Vol. 1, No. 3, January, 1901
Ohio State University. Biological Club
344 Gutenberg downloadsen2023Difficulty 53 (Graduate)
Die organische Chemie in ihrer Anwendung auf Physiologie und Pathologie
Liebig, Justus, Freiherr von
343 Gutenberg downloadsde2017
Two New Pocket Gophers from Wyoming and Colorado
Hall, E. Raymond (Eugene Raymond) & Montague, H. Gordon
343 Gutenberg downloadsen2009Difficulty 51 (Graduate)
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White, John A.
342 Gutenberg downloadsen2010Difficulty 54 (Graduate)
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Oliver, Charles A. (Charles Alexander)
342 Gutenberg downloadsen1998Difficulty 51 (Graduate)
Account of the Skeleton of the Mammoth A non-descript carnivorous animal of immense size, found in America
Peale, Rembrandt
341 Gutenberg downloadsen2015Difficulty 66 (Academic)
Report on the Migration of Birds in the Spring and Autumn of 1883. Fifth Report
Harvie-Brown, J. A. (John Alexander) & Barrington, Richard Manliffe & Cordeaux, John & More, Alexander Goodman
341 Gutenberg downloadsen2021Difficulty 44 (College)
The O. S. U. Naturalist, Vol. 1, No. 1, November, 1900
Ohio State University. Biological Club
341 Gutenberg downloadsen2017Difficulty 56 (Graduate)
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Capello, Felix Antonio de Brito
340 Gutenberg downloadsfr2010
Mushroom and Toadstools How to Distinguish Easily the Differences Between Edible and Poisonous Fungi
Smith, Worthington George
340 Gutenberg downloadsen2019Difficulty 49 (College)
The flowering plants of South Africa; vol. 5
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340 Gutenberg downloadsen2025Difficulty 50 (College)
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340 Gutenberg downloadsen2023Difficulty 58 (Graduate)
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339 Gutenberg downloadsen2010Difficulty 53 (Graduate)
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339 Gutenberg downloadsen2011Difficulty 60 (Graduate)
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339 Gutenberg downloadsen2008Difficulty 52 (Graduate)
The flowering plants of South Africa; vol. 2
Unknown
339 Gutenberg downloadsen2021Difficulty 51 (Graduate)
The Kingdom of Man
Lankester, E. Ray (Edwin Ray), Sir
339 Gutenberg downloadsen2019Difficulty 61 (Academic)
The preparation & mounting of microscopic objects
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339 Gutenberg downloadsen2019Difficulty 53 (Graduate)
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Fröhner, Eugen
338 Gutenberg downloadsde2022
Three New Beavers from Utah
Durrant, Stephen David & Crane, Harold S. (Harold Samuel)
338 Gutenberg downloadsen2010Difficulty 61 (Academic)
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337 Gutenberg downloadsen2016Difficulty 54 (Graduate)
The Sense of Taste
Hollingworth, Harry L. (Harry Levi) & Poffenberger, Albert T. (Albert Theodore)
337 Gutenberg downloadsen2019Difficulty 69 (Academic)
A Preliminary Revision of the North American Species of Cactus, Anhalonium, and Lophophora
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336 Gutenberg downloadsen1998Difficulty 56 (Graduate)
Het Leven der Dieren: Deel 1, Hoofdstuk 05: Robben; Hoofdstuk 06: Insecteneters
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336 Gutenberg downloadsnl2006
The heathery; or, A monograph of the genus Erica. vol. 1
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336 Gutenberg downloadsen2022Difficulty 52 (Graduate)
The Preparation of Bees for Outdoor Wintering
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336 Gutenberg downloadsen2019Difficulty 53 (Graduate)
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335 Gutenberg downloadsen2022Difficulty 59 (Graduate)
Florulae Insularum Australium Prodromus
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335 Gutenberg downloadsla2011
Prodromus Florae Norfolkicae Sive, Catalogus stirpium quae in insula Norfolk annis 1804 et 1805 a Ferdinando Bauer collectae et depictae, nunc in Museo caesareo palatino rerum naturalium Vindobonae servantur
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335 Gutenberg downloadsla2012
Sir William Flower
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335 Gutenberg downloadsen2025Difficulty 72 (Expert)
A New Pocket Mouse (Genus Perognathus) from Kansas
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334 Gutenberg downloadsen2010Difficulty 51 (Graduate)
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Anderson, Sydney
334 Gutenberg downloadsen2010Difficulty 53 (Graduate)
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334 Gutenberg downloadsnl2010
Le Sud-Oranais: études floristiques et phytogéographiques faites au cours d'une exploration dans le Sud-Ouest de l'Algérie en 1901
Hochreutiner, B. P. G. (Bénédict Pierre Georges)
334 Gutenberg downloadsfr2025
The Nautilus. Vol. XXXI, No. 2, October 1917 A Quarterly Journal Devoted to the Interests of Conchologists
Various
334 Gutenberg downloadsen2019Difficulty 52 (Graduate)
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334 Gutenberg downloadsen2019Difficulty 69 (Academic)
A New Bog Lemming (Genus Synaptomys) From Nebraska
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333 Gutenberg downloadsen2010Difficulty 62 (Academic)
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333 Gutenberg downloadsen2025Difficulty 60 (Graduate)
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Reuther, Antoine Charles
333 Gutenberg downloadsnl2009
Cholera and the Water Supply in the South Districts of London in 1854
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333 Gutenberg downloadsen2021Difficulty 71 (Expert)
Pleistocene Soricidae from San Josecito Cave, Nuevo Leon, Mexico
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333 Gutenberg downloadsen2010Difficulty 58 (Graduate)
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333 Gutenberg downloadsen2019Difficulty 64 (Academic)
Hints on the History and Management of the Honey Bee Being the Substance of Two Lectures Read Before the Members of the Hereford Literary, Philosophical, and Antiquarian Institution, in the Winter of 1850-51
Bevan, Edward
331 Gutenberg downloadsen2022Difficulty 64 (Academic)
Report on the Migration of Birds in the Spring and Autumn of 1881. Third Report
Harvie-Brown, J. A. (John Alexander) & Barrington, Richard Manliffe & Cordeaux, John & Kermode, P. M. C. (Philip Moore Callow) & More, Alexander Goodman
331 Gutenberg downloadsen2021Difficulty 41 (College)
The Florist and Horticultural Journal, Vol. II. No. 7, July, 1853 A Monthly Magazine of Horticulture, Agriculture, Botany, Agricultural Chemistry, Entomology, &c.
Various
331 Gutenberg downloadsen2018Difficulty 55 (Graduate)
The Story of Creation as Told By Theology and By Science
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331 Gutenberg downloadsen2003Difficulty 62 (Academic)
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330 Gutenberg downloadsen2025Difficulty 63 (Academic)
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330 Gutenberg downloadsen2010Difficulty 56 (Graduate)
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330 Gutenberg downloadsnl2007
The American Apiculturist. Vol. III. No. 6, June 15, 1885 A Journal Devoted to Scientific and Practical Beekeeping
Various
330 Gutenberg downloadsen2018Difficulty 54 (Graduate)
Unsere Haustiere vom Standpunkte ihrer wilden Verwandten
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330 Gutenberg downloadsde2018
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329 Gutenberg downloadsnl2005
Journal of Entomology and Zoology, Vol. 09, No. 3, September 1917
Various
329 Gutenberg downloadsen2015Difficulty 56 (Graduate)
Report on the Migration of Birds in the Autumn of 1879. [First Report]
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329 Gutenberg downloadsen2021Difficulty 40 (High School)
Taxonomic Status of Some Mice of The Peromyscus boylii Group in Eastern Mexico, With Description of a New Subspecies
Alvarez, Ticul
329 Gutenberg downloadsen2010Difficulty 52 (Graduate)
An Account of the Sore Throat Attended With Ulcers A Disease Which Hath of Late Years Appeared in This City, and in Several Parts of the Nation
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328 Gutenberg downloadsen2017Difficulty 67 (Academic)
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328 Gutenberg downloadsnl2020
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328 Gutenberg downloadsen2010Difficulty 55 (Graduate)
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327 Gutenberg downloadsen2023Difficulty 60 (Graduate)
The Philosophy of Health; Volume 2 (of 2) or, an exposition of the physical and mental constitution of man
Smith, Southwood
327 Gutenberg downloadsen2019Difficulty 72 (Expert)
Observations on the Terataspis grandis, Hall, the largest known trilobite
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326 Gutenberg downloadsen2022Difficulty 60 (Graduate)
Rapport sur une mission botanique exécutée en 1884 dans la région saharienne, au nord des grands chotts et dans les îles de la côte orientale de la Tunisie
Doumet-Adanson, Napoléon
326 Gutenberg downloadsfr2024
The Pigmy Woodrat, Neotoma goldmani, Its Distribution and Systematic Position
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326 Gutenberg downloadsen2010Difficulty 61 (Academic)
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Cook, O. F. (Orator Fuller)
325 Gutenberg downloadsen2023Difficulty 63 (Academic)
Time and Life: Mr. Darwin's "Origin of Species"
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325 Gutenberg downloadsen2001Difficulty 72 (Expert)
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324 Gutenberg downloadsen2010Difficulty 57 (Graduate)
De Harmonie van het Dierlijke Leven: De Openbaring van Wetten
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324 Gutenberg downloadsnl2005
Pleistocene Pocket Gophers From San Josecito Cave, Nuevo Leon, Mexico
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324 Gutenberg downloadsen2010Difficulty 60 (Graduate)
Notes on Diseases of Swine, Sheep, Poultry and the Dog Cause, Symptoms and Treatments
Korinek, Charles James
323 Gutenberg downloadsen2019Difficulty 55 (Graduate)
Tadarida femorosacca (Merriam) in Tamaulipas, Mexico
Dalquest, Walter Woelber & Hall, E. Raymond (Eugene Raymond)
323 Gutenberg downloadsen2010Difficulty 53 (Graduate)
The botanist's repository for new and rare plants; vol. 06 [of 10]
Andrews, Henry Cranke, active 1799-1828
323 Gutenberg downloadsen2024Difficulty 63 (Academic)
Colour vision : $b Being the Tyndall Lectures delivered in 1894 at the Royal Institution
Abney, William de Wiveleslie, Sir
322 Gutenberg downloadsen2024Difficulty 55 (Graduate)
The Anatomy of Vegetables Begun With a General Account of Vegetation founded thereon
Grew, Nehemiah
322 Gutenberg downloadsen2018Difficulty 48 (College)
A New Subspecies of Ground Squirrel (Spermophilus spilosoma) from Tamaulipas, Mexico
Alvarez, Ticul
321 Gutenberg downloadsen2011Difficulty 64 (Academic)
The heathery; or, A monograph of the genus Erica. vol. 3
Andrews, Henry Cranke, active 1799-1828
321 Gutenberg downloadsen2023Difficulty 56 (Graduate)
A New Species of Wood Rat (Neotoma) from Northeastern Mexico
Alvarez, Ticul
320 Gutenberg downloadsen2011Difficulty 54 (Graduate)
De Usu Ratiocinii Mechanici in Medicina
Boerhaave, Herman
320 Gutenberg downloadsla2005
Dissertatio inauguralis physico-medica de respiratione quam consensu & auctoritate gratiosissimi medicorum ordinis in universitate patria pro summis in arte medica honoribus & privilegiis doctoralibus rite consequendis....
Bernoulli, Daniel
320 Gutenberg downloadsla2013
Het Leven der Dieren: Deel 1, Hoofdstuk 12: Sirenen; Hoofdstuk 13: Walvischachtigen
Brehm, Alfred Edmund
320 Gutenberg downloadsnl2007
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W.B. Saunders Company
320 Gutenberg downloadsen2017Difficulty 61 (Academic)
The Hunterian lectures on colour-vision and colour-blindness
Edridge-Green, F. W. (Frederick William)
320 Gutenberg downloadsen2025Difficulty 56 (Graduate)
A New Species of Heteromyid Rodent from the Middle Oligocene of Northeast Colorado with Remarks on the Skull
Galbreath, Edwin C. (Edwin Carter)
319 Gutenberg downloadsen2010Difficulty 57 (Graduate)
Complete Treatise on the mare and foal at the time of delivery, with illustrations. Also on cows and calves, with stallion and mare, when diseased by Gonorrhea (clap) or Pox, also Diarrhea and Costiveness in Colts.
Mitchell, Conrad
319 Gutenberg downloadsen2016Difficulty 49 (College)
Het Leven der Dieren: Deel 2, Hoofdstuk 11 tot 14: Hoenderkoeten; Nandoes; Kasuarisvogels; Struisen; Hagedisvogels
Brehm, Alfred Edmund
319 Gutenberg downloadsnl2012
Im Zauber des Tierlebens
Lucanus, Friedrich von
319 Gutenberg downloadsde2024
The heathery; or, A monograph of the genus Erica. vol. 5
Andrews, Henry Cranke, active 1799-1828
319 Gutenberg downloadsen2023Difficulty 56 (Graduate)
Coral and Coral Reefs
Huxley, Thomas Henry
318 Gutenberg downloadsen2001Difficulty 58 (Graduate)
Der Mensch der Zukunft
Bölsche, Wilhelm
318 Gutenberg downloadsde2018
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Fox, Herbert
318 Gutenberg downloadsen2025Difficulty 55 (Graduate)
Rapport sur une mission botanique exécutée en 1884 dans le nord, le sud et l'ouest de la Tunisie
Letourneux, A. (Aristide)
318 Gutenberg downloadsfr2024
Section-Cutting A Practical Guide to the Preparation and Mounting of Sections for the Microscope, Special Prominence Being given to the Subject of Animal Sections
Marsh, Sylvester
318 Gutenberg downloadsen2017Difficulty 61 (Academic)
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Chun, Carl
317 Gutenberg downloadsde2014
Schutz- und Trutzbündnisse in der Natur
Bölsche, Wilhelm
317 Gutenberg downloadsde2015
Some possible bearings of genetics on pathology
Morgan, Thomas Hunt
317 Gutenberg downloadsen2023Difficulty 57 (Graduate)
Tentamen Botanicum de Filicum Generibus Dorsiferarum Mémoires de l'Académie Royale des Sciences de Turin vol. 5, 401-422
Smith, James Edward
317 Gutenberg downloadsla2012
Evolution
Hoare, Edward
316 Gutenberg downloadsen2016Difficulty 55 (Graduate)
Fauna der Nassauischen Mollusken
Kobelt, Wilhelm
315 Gutenberg downloadsde2015
Het Leven der Dieren: Deel 2, Hoofdstuk 10: De Stootvogels
Brehm, Alfred Edmund
315 Gutenberg downloadsnl2012
The Ohio Naturalist, Vol. I, No. 7, May, 1901
Ohio State University. Biological Club
315 Gutenberg downloadsen2023Difficulty 51 (Graduate)
The Underworld of Oregon Caves National Monument
Contor, Roger J.
315 Gutenberg downloadsen2019Difficulty 56 (Graduate)
A Letter on Suspended Animation containing experiments shewing that it may be safely employed during operations on animals
Hickman, Henry Hill
314 Gutenberg downloadsen2018Difficulty 77 (Expert)
Physiology and histology of the Cubomedusæ including Dr. F.S. Conant's notes on the physiology
Berger, E. W. (Edward William)
314 Gutenberg downloadsen2017Difficulty 62 (Academic)
A study of mushrooms and mushroom spawn
Jacob, Edward Henry
313 Gutenberg downloadsen2023Difficulty 50 (College)
Catalogue of the dipterous insects collected at Singapore and Malacca
Wallace, Alfred Russel
313 Gutenberg downloadsen2023Difficulty 56 (Graduate)
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Niles, Grace Greylock
312 Gutenberg downloadsen2025Difficulty 61 (Academic)
Der Ameisenlöwe : $b eine biologische, tierpsychologische und reflexbiologische Untersuchung
Doflein, Franz
312 Gutenberg downloadsde2025
Systematic Status of a South American Frog, Allophryne ruthveni Gaige
Lynch, John D. & Freeman, Howard L.
312 Gutenberg downloadsen2010Difficulty 63 (Academic)
Die krankheiterregenden Bakterien Entstehung, Heilung und Bekämpfung der bakteriellen Infektionskrankheiten des Menschen
Löhlein, Max
311 Gutenberg downloadsde2017
Straußenpolitik : $b Neue Tierfabeln
Zell, Th. (Theodor)
311 Gutenberg downloadsde2025
An Essay on the Effects of Opium. Considered as a Poison
Awsiter, John
310 Gutenberg downloadsen2016Difficulty 75 (Expert)
Het Leven der Dieren, Deel 3, Hoofdstuk 04: De Insecten
Brehm, Alfred Edmund
310 Gutenberg downloadsnl2020
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Armes, William
309 Gutenberg downloadsen2017Difficulty 66 (Academic)
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Kalm, Pehr
309 Gutenberg downloadsnl2023
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Coe, H. S. & Martin, John N. (John Nathan)
309 Gutenberg downloadsen2020Difficulty 60 (Graduate)
The Ohio Naturalist, vol. II, no. 2, December, 1901
Ohio State University. Biological Club
309 Gutenberg downloadsen2023Difficulty 64 (Academic)
The suppression of tuberculosis $b Together with observations concerning phthisiogenesis in man and animals and suggestions concerning the hygiene of cow stables and the production of milk for infant-feeding, with special reference to tuberculosis
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308 Gutenberg downloadsen2023Difficulty 67 (Academic)
De martelaars der wetenschap
Tissandier, Gaston
307 Gutenberg downloadsnl2018
Subspeciation in the Meadow Mouse, Microtus pennsylvanicus, in Wyoming, Colorado, and Adjacent Areas
Anderson, Sydney
307 Gutenberg downloadsen2010Difficulty 61 (Academic)
The Cubomedusæ
Conant, Franklin Story
307 Gutenberg downloadsen2017Difficulty 60 (Graduate)
Arabische Pflanzennamen aus Aegypten, Algerien und Jemen
Schweinfurth, Georg August
305 Gutenberg downloadsde2024
Aus dem Leben der Insekten
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305 Gutenberg downloadsde2022
Het Leven der Dieren, Deel 3, Hoofdstuk 6: De Wormen
Brehm, Alfred Edmund
304 Gutenberg downloadsnl2020
Einheimische Fische; Die Süßwasserfische unsrer Heimat
Floericke, Kurt
303 Gutenberg downloadsde2012
Suomen maan Meripedot: maalikuvilla selitetyt
Eurén, Gustaf Erik
303 Gutenberg downloadsfi2005
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Gilman, Herbert Lester
301 Gutenberg downloadsen2024Difficulty 67 (Academic)
Proefnemingen van de particuliere beweeging der spieren in de kikvorsch
Swammerdam, Jan
301 Gutenberg downloadsnl2006
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Greenhow, T. M. (Thomas Michael)
300 Gutenberg downloadsen2015Difficulty 70 (Academic)
Piebald rats and selection : $b An experimental test of the effectiveness of selection and of the theory of gametic purity in Mendelian crosses
Castle, William E. (William Ernest) & Phillips, John C. (John Charles)
300 Gutenberg downloadsen2024Difficulty 54 (Graduate)
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Russell, Robert J.
299 Gutenberg downloadsen2010Difficulty 60 (Graduate)
Rodent Control Aided by Emergency Conservation Work
Young, Stanley Paul
299 Gutenberg downloadsen2019Difficulty 64 (Academic)
A Statement of Facts Tending to Establish an Estimate of the True Value and Present State of Vaccination
Blane, Gilbert, Sir
298 Gutenberg downloadsen2022Difficulty 67 (Academic)
Das Mikroskop und seine Anwendung Ein Leitfaden bei mikroskopischen Untersuchungen
Hager, Hermann
298 Gutenberg downloadsde2015
Westafrikanische Kautschuk-Expedition
Schlechter, Rudolf & Deutsche Kolonialgesellschaft. Kolonial-Wirtschaftliches Komitee
298 Gutenberg downloadsde2022
Four New Pocket Gophers of the Genus Cratogeomys from Jalisco, Mexico
Russell, Robert J.
297 Gutenberg downloadsen2010Difficulty 61 (Academic)
Mammals from Southeastern Alaska
Baker, Rollin H. (Rollin Harold) & Findley, James S. (James Smith)
297 Gutenberg downloadsen2010Difficulty 57 (Graduate)
Pflanzenleben in Feld und Garten
Buckley, Arabella B. (Arabella Burton)
297 Gutenberg downloadsde2022
The American Bee Journal, Vol. VI., Number 5, November 1870
Various
297 Gutenberg downloadsen2018Difficulty 53 (Graduate)
L'intelligence des fleurs
Maeterlinck, Maurice
296 Gutenberg downloadsfr2020
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Roosevelt, Theodore
295 Gutenberg downloadsen2023Difficulty 70 (Academic)
La flore utile du bassin de la Gambie
Rançon, A. (André)
295 Gutenberg downloadsfr2024
Lajien synty: Luonnollisen valinnan kautta
Darwin, Charles
295 Gutenberg downloadsfi2016
Palæontological Report of the Princeton Scientific Expedition of 1877
Osborn, Henry Fairfield & Scott, William Berryman & Speir, Francis
294 Gutenberg downloadsen2021Difficulty 56 (Graduate)
Vasárnapi Könyv. 1914. Első félév 15. füzet
Various
294 Gutenberg downloadshu2009
Which Shall Live—Men or Animals?
Baynes, Ernest Harold
294 Gutenberg downloadsen2021Difficulty 61 (Academic)
Über den Bildungstrieb
Blumenbach, Johann Friedrich
294 Gutenberg downloadsde2020
The bedbug : $b Its relation to public health, its habits and life history, and methods of control
United States. Public Health Service
293 Gutenberg downloadsen2023Difficulty 60 (Graduate)
Aus Natur und Geisteswelt Sammlung wissenschaftlich-gemeinverständlicher Darstellungen aus allen Gebieten des Wissens
B.G. Teubner (Firm)
292 Gutenberg downloadsde2016
De Rariorum Animalium atque Stirpium Historia
Caius, John
292 Gutenberg downloadsla2008
An Attempt to Investigate the Seat of Animal Life
Curtis, Henry
291 Gutenberg downloadsen2021Difficulty 71 (Expert)
Experiments on the Nervous System with Opium and Metalline Substances Made Chiefly with the View of Determining the Nature and Effects of Animal Electricity
Monro, Alexander
291 Gutenberg downloadsen2014Difficulty 66 (Academic)
Nitrogen Bacteria and Legumes With special reference to red clover, cowpeas, soy beans, alfalfa, and sweet clover, on Illinois soils
Hopkins, Cyril G. (Cyril George)
291 Gutenberg downloadsen2018Difficulty 58 (Graduate)
A Guide for the Dissection of the Dogfish (Squalus Acanthias)
Griffin, Lawrence Edmonds
290 Gutenberg downloadsen2019Difficulty 54 (Graduate)
Handboek voor Bijenhouders
Dirks, J.
290 Gutenberg downloadsnl2010
House Flies
Howard, L. O. (Leland Ossian)
290 Gutenberg downloadsen2019Difficulty 56 (Graduate)
The Canadian Entomologist, Vol. XII., No. 2, February 1880
Various
289 Gutenberg downloadsen2018Difficulty 47 (College)
Archimedes; or, the future of physics
Whyte, Lancelot Law
288 Gutenberg downloadsen2025Difficulty 66 (Academic)
Inferences from Haunted Houses and Haunted Men
Harris, J. W. (John William)
288 Gutenberg downloadsen2004Difficulty 50 (College)
Thoughts on General and Partial Inoculations Containing a translation of two treatises written when the author was at Petersburg, and published there, by Command of her Imperial Majesty, in the Russian Language
Dimsdale, Thomas
285 Gutenberg downloadsen2015Difficulty 67 (Academic)
The Ohio Journal of Science, Vol. XVI, No. 1, November 1915
Various
284 Gutenberg downloadsen2017Difficulty 50 (College)
Über die Vulkane im Monde
Kant, Immanuel
284 Gutenberg downloadsde2012
De koraal-eilanden: fragment uit het dagboek van een natuuronderzoeker De Aarde en haar Volken, 1875
Darwin, Charles
283 Gutenberg downloadsnl2015
Coloured engravings of heaths; vol. 3
Andrews, Henry Cranke, active 1799-1828
282 Gutenberg downloadsen2023Difficulty 66 (Academic)
Der Tabak: Studien über seine Kultur und Biologie
Koning, C. J. (Cornelis Johan)
281 Gutenberg downloadsde2016
The Kansas University Science Bulletin (Vol. I, No. 1)
Various
281 Gutenberg downloadsen2017Difficulty 50 (College)
The little book of British quadrupeds
May, W.
280 Gutenberg downloadsen2024Difficulty 44 (College)
Influenza
Provincial Board of Health of Ontario
279 Gutenberg downloadsen2019Difficulty 68 (Academic)
The heathery; or, A monograph of the genus Erica. vol. 4
Andrews, Henry Cranke, active 1799-1828
279 Gutenberg downloadsen2023Difficulty 56 (Graduate)
Az ember helye a természetben
Lenhossék, Mihály
278 Gutenberg downloadshu2024
Höherzüchtung des Menschen auf biologischer Grundlage. Vortrag
Franze, Paul Christian
277 Gutenberg downloadsde2013
Noções botanicas das especies de Nicociana mais usadas nas fabricas de tabaco, e da sua cultura
Unknown
276 Gutenberg downloadspt2012
Antony van Leeuwenhoek, de ontdekker der infusorien, 1675-1875
Haaxman, P. J.
275 Gutenberg downloadsnl2021
Het Leven der Dieren, Deel 3, Hoofdstuk 5: De Spinachtigen
Brehm, Alfred Edmund
275 Gutenberg downloadsnl2020
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Gosse, Philip Henry
275 Gutenberg downloadsen2024Difficulty 48 (College)
La espressione dei sentimenti dei nostri volatili domestici
Pascal, Teodoro
275 Gutenberg downloadsit2017
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Boeke, Jan
274 Gutenberg downloadsnl2017
The Ohio Naturalist, Vol. II, No. 1, November, 1901
Ohio State University. Biological Club
274 Gutenberg downloadsen2023Difficulty 53 (Graduate)
Meeresfische
Floericke, Kurt
273 Gutenberg downloadsde2018
The Fern Bulletin, October 1903 A Quarterly Devoted to Ferns
Various
273 Gutenberg downloadsen2018Difficulty 50 (College)
Darwinism. The Noachian Flood A lecture delivered before the Torquay Natural History Society, Jan. 31st, 1870
Stebbing, Thomas Roscoe Rede
272 Gutenberg downloadsen2021Difficulty 68 (Academic)
In sloot en plas
Heimans, Eli & Thijsse, Jac. P. (Jacobus Pieter)
272 Gutenberg downloadsnl2022
Rapport sur un voyage botanique en Algérie, de Philippeville à Biskra et dans les Monts Aurès, entrepris en 1853 sous le patronage du Ministère de la guerre
Cosson, E. (Ernest)
271 Gutenberg downloadsfr2024
Geschichte der Zoologie
Burckhardt, Rudolf
270 Gutenberg downloadsde2024
How Does a Tree Grow? Or, Botany for Young Australians
Bonwick, James
270 Gutenberg downloadsen2018Difficulty 34 (High School)
The Kansas University science bulletin, Vol. I, No. 8, September 1902
Unknown
270 Gutenberg downloadsen2023Difficulty 64 (Academic)
The Ohio naturalist, Vol. 1, No. 4, February 1901
Ohio State University. Biological Club
269 Gutenberg downloadsen2022Difficulty 49 (College)
Carlo Darwin
Lessona, Michele
268 Gutenberg downloadsit2014
Powder-Post Beetles in Buildings: What to Do About Them
St. George, R. A. (Raymond Alexander) & McIntyre, T.
268 Gutenberg downloadsen2019Difficulty 50 (College)
Die Protozoen als Krankheitserreger des Menschen und der Hausthiere Für Ärzte, Thierärzte und Zoologen
Schneidemühl, Georg
267 Gutenberg downloadsde2016
The Ornithologist and Oölogist. Vol. VIII No. 3, March 1883 Birds: Their Nests and Eggs
Various
267 Gutenberg downloadsen2019Difficulty 42 (College)
Het Leven der Dieren: Deel 3.8, De Stekelhuidigen, Plantdieren en Sponsen
Brehm, Alfred Edmund
266 Gutenberg downloadsnl2020
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Pascal, Teodoro
266 Gutenberg downloadsit2018
Blonde duinen
Thijsse, Jac. P. (Jacobus Pieter)
265 Gutenberg downloadsnl2025
The Ohio naturalist, Vol. 1, No. 8, June 1901
Ohio State University. Biological Club
265 Gutenberg downloadsen2022Difficulty 51 (Graduate)
An inaugural dissertation on pulmonary consumption
Delafield, Edward
263 Gutenberg downloadsen2022Difficulty 63 (Academic)
Het Leven der Dieren. Deel 3, Hoofdstuk 5: De Amphibiën
Brehm, Alfred Edmund
262 Gutenberg downloadsnl2014
Le piante utili dell' Eritrea
Schweinfurth, Georg August
262 Gutenberg downloadsit2025
Études sur la flore du Sénégal
Vallot, Joseph
261 Gutenberg downloadsfr2024
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Hall, Frank H. (Frank Henry) & Harding, Harry Alexis & Rogers, L. A. (Lore Alford) & Smith, George A.
259 Gutenberg downloadsen2022Difficulty 56 (Graduate)
The Kansas University Science Bulletin, Vol. I, No. 2, February, 1902
Various
258 Gutenberg downloadsen2017Difficulty 52 (Graduate)
Zakflora voor Suriname [Deel I] Bulletin van het Koloniaal Museum te Haarlem No. 47.
Pulle, A. A. (August Adriaan)
257 Gutenberg downloadsnl2017
Els aucells més útils a la agricultura de Catalunya
Tarré, Emili
252 Gutenberg downloadsca2024
The O. S. U. Naturalist, Vol. 1, No. 2, December, 1900
Ohio State University. Biological Club
252 Gutenberg downloadsen2023Difficulty 52 (Graduate)
Evolution made plain
Mason, John (John Harmon)
251 Gutenberg downloadsen2025Difficulty 55 (Graduate)
Muistelmia hyönteismaailmasta: Kuvauksia hyönteisten tavoista ja vaistosta
Fabre, Jean-Henri
248 Gutenberg downloadsfi2021
Das Protoplasma der Rhizopoden und der Pflanzenzellen ein Beitrag zur Theorie der Zelle
Schultze, Max
243 Gutenberg downloadsde2022
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Marsili, Giovanni
243 Gutenberg downloadsit2005
The Meaning of Infancy
Fiske, John
243 Gutenberg downloadsen2004Difficulty 62 (Academic)
Le livree dei nostri volatili domestici in rapporto allo sport, alla produttività ed alla rusticità
Pascal, Teodoro
241 Gutenberg downloadsit2019
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Lönnrot, Elias
240 Gutenberg downloadsfi2017
Säugethiere vom Celebes- und Philippinen-Archipel
Meyer, Adolf Bernhard
240 Gutenberg downloadsde2023
Reprint of Two Tracts 1. An essay on gleets. 2. An enquiry into the nature, cause, and cure of a singular disease of the eyes
Marat, Jean Paul
239 Gutenberg downloadsen2018Difficulty 56 (Graduate)
Zwischen Pol und Äquator: Tiergeographische Lebensbilder
Floericke, Kurt
237 Gutenberg downloadsde2022
Case of Filaria loa
Robertson, Douglas Argyll
230 Gutenberg downloadsen2023Difficulty 50 (College)
A természettudomány fejlődésének története (1. kötet)
Bölsche, Wilhelm
228 Gutenberg downloadshu2022
Das Protistenreich : $b eine populäre Uebersicht über das Formengebiet der niedersten Lebewesen; Mit einem wissenschaftlichen Anhange: System der Protisten
Haeckel, Ernst
225 Gutenberg downloadsde2025
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Bölsche, Wilhelm
225 Gutenberg downloadsnl2025
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Brehm, Alfred Edmund
223 Gutenberg downloadsnl2021
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Hérincq, F. (François)
218 Gutenberg downloadsfr2025
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Palmén, J. A. (Johan Axel)
199 Gutenberg downloadsfi2024
Naturgeschichte des Fasans : $b Ein Auszug aus den Schriften der bewährtesten Naturforscher
Anonymous
177 Gutenberg downloadsde2023
L'idée médicale dans les romans de Paul Bourget
Grasset, J. (Joseph)
145 Gutenberg downloadsfr2019

Life and Letters of Charles Darwin — Volume 1

More Letters of Charles Darwin — Volume 1 A Record of His Work in a Series of Hitherto Unpublished Letters

The Notebooks of Leonardo Da Vinci — Complete

Letters of Asa Gray; Vol. 2

The Natural History of Pliny, Volume 3 (of 6)

On the Origin of Species By Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life

Studies of American Fungi. Mushrooms, Edible, Poisonous, etc.

The elements of bacteriological technique : $b a laboratory guide for medical, dental, and technical students

Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants

Cattle and Their Diseases Embracing Their History and Breeds, Crossing and Breeding, and Feeding and Management; with the Diseases to Which They Are Subject, and the Remedies Best Adapted to Their Cure

Explanation of Terms Used in Entomology

The Theories of Darwin and Their Relation to Philosophy, Religion, and Morality

The Origin of Species by Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life, 6th Edition

Evolution, Old & New Or, the Theories of Buffon, Dr. Erasmus Darwin and Lamarck, as compared with that of Charles Darwin

Contributions to the Theory of Natural Selection A Series of Essays

The Variation of Animals and Plants Under Domestication, Vol. I.

Delineations of the Ox Tribe: The Natural History of Bulls, Bisons, and Buffaloes. Exhibiting all the Known Species and the More Remarkable Varieties of the Genus Bos.

The Medicinal Plants of the Philippines

Zoölogische Philosophie Of beschouwingen over de Natuurlijke Historie der dieren etc.

Mysteries of Bee-keeping Explained

Sir Jagadis Chunder Bose, His Life and Speeches

Insects and Diseases A Popular Account of the Way in Which Insects may Spread or Cause some of our Common Diseases

The book of wonders : $b gives plain and simple answers to the thousands of everyday questions that are asked and which all should be able to, but cannot answer...

Birds of the Rockies

On the Origin of Species by Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life. (2nd edition)

The Descent of Man, and Selection in Relation to Sex

Herbal simples approved for modern uses of cure

The Voyage of the Beagle

Darwin, and After Darwin, Volumes 1 and 3 An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions

An Elementary Study of Insects

The Stock-Feeder's Manual the chemistry of food in relation to the breeding and feeding of live stock

The Expression of the Emotions in Man and Animals

The Foundations of the Origin of Species Two Essays written in 1842 and 1844

American Weasels

On Growth and Form

Makers of British Botany; a collection of biographies by living botanists

Evolution in Modern Thought

The Dawn of Reason; or, Mental Traits in the Lower Animals

Outlines of Dairy Bacteriology, 8th edition A Concise Manual for the Use of Students in Dairying

The Evolution of Man

Identification of the Larger Fungi

Micrographia Some Physiological Descriptions of Minute Bodies Made by Magnifying Glasses with Observations and Inquiries Thereupon

Encyclopaedia Britannica, 11th Edition, "Ichthyology" to "Independence" Volume 14, Slice 3

The Natural History of Pliny, Volume 5 (of 6)

Freedom in Science and Teaching. from the German of Ernst Haeckel

The Journal of a Disappointed Man

Man And His Ancestor: A Study In Evolution

Rollo's Experiments

The Genus Pinus

The Animal Parasites of Man

Aristotle's History of Animals In Ten Books

The Story-book of Science

Vestiges of the Natural History of Creation

Handbook of Birmingham Prepared for the Members of the British Association, 1886

Origin of Cultivated Plants The International Scientific Series Volume XLVIII

At the Deathbed of Darwinism: A Series of Papers

The Principles of Biology, Volume 1 (of 2)

The Common Spiders of the United States

Are the Effects of Use and Disuse Inherited? An Examination of the View Held by Spencer and Darwin

The Glow-Worm and Other Beetles

A text-book of veterinary anatomy

Species Plantarum, Sections IV-V

Encyclopaedia Britannica, 11th Edition, "Matter" to "Mecklenburg" Volume 17, Slice 8

Het Leven der Dieren: Deel 1, Hoofdstuk 01: De Apen

The Autobiography of Charles Darwin

Toadstools, mushrooms, fungi, edible and poisonous; one thousand American fungi How to select and cook the edible; how to distinguish and avoid the poisonous, with full botanic descriptions. Toadstool poisons and their treatment, instructions to students, recipes for cooking, etc., etc.

Evidence as to Man's Place in Nature

Himalayan Journals — Complete Or, Notes of a Naturalist in Bengal, the Sikkim and Nepal Himalayas, the Khasia Mountains, etc.

Journal of Researches into the Natural History and Geology of the Countries Visited During the Voyage Round the World of H.M.S. Beagle Under the Command of Captain Fitz Roy, R.N.

Encyclopaedia Britannica, 11th Edition, "Echinoderma" to "Edward, prince of Wales" Volume 8, Slice 10

Mammals of Washington, Volume 2 University of Kansas Publications Museum of Natural History

The Book of the Pearl The history, art, science, and industry of the queen of gems

The Biotic Associations of Cockroaches

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