Curated Shelf

Biology

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

1491 WorksDrawn from Project Gutenberg Bookshelf #669

Life and Letters of Charles Darwin — Volume 1
Darwin, Charles
30,219 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More Letters of Charles Darwin — Volume 1 A Record of His Work in a Series of Hitherto Unpublished Letters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
29,584 Gutenberg downloadsen2001Difficulty 50 (College)
The Natural History of Pliny, Volume 3 (of 6)
Pliny, the Elder
21,423 Gutenberg downloadsen2019Difficulty 38 (High School)
Letters of Asa Gray; Vol. 2
Gray, Asa
20,251 Gutenberg downloadsen2017Difficulty 47 (College)
The Notebooks of Leonardo Da Vinci — Complete
Leonardo, da Vinci
18,817 Gutenberg downloadsen2004Difficulty 52 (Graduate)
Studies of American Fungi. Mushrooms, Edible, Poisonous, etc.
Atkinson, George Francis
18,806 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)
13,544 Gutenberg downloadsen2009Difficulty 59 (Graduate)
Contributions to the Theory of Natural Selection A Series of Essays
Wallace, Alfred Russel
13,227 Gutenberg downloadsen2007Difficulty 63 (Academic)
On the Origin of Species By Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life
Darwin, Charles
13,194 Gutenberg downloadsen1998Difficulty 61 (Academic)
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
Masters, Maxwell T. (Maxwell Tylden)
11,237 Gutenberg downloadsen2007Difficulty 61 (Academic)
The Variation of Animals and Plants Under Domestication, Vol. I.
Darwin, Charles
10,880 Gutenberg downloadsen2008Difficulty 67 (Academic)
Evolution, Old & New Or, the Theories of Buffon, Dr. Erasmus Darwin and Lamarck, as compared with that of Charles Darwin
Butler, Samuel
10,722 Gutenberg downloadsen2007Difficulty 57 (Graduate)
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
10,337 Gutenberg downloadsen2007Difficulty 67 (Academic)
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
9,850 Gutenberg downloadsen2007Difficulty 73 (Expert)
The Theories of Darwin and Their Relation to Philosophy, Religion, and Morality
Schmid, Rudolf
8,627 Gutenberg downloadsen2007Difficulty 56 (Graduate)
Mysteries of Bee-keeping Explained
Quinby, M. (Moses)
8,619 Gutenberg downloadsen2008Difficulty 78 (Expert)
Birds of the Rockies
Keyser, Leander S. (Leander Sylvester)
7,518 Gutenberg downloadsen2008Difficulty 58 (Graduate)
Insects and Diseases A Popular Account of the Way in Which Insects may Spread or Cause some of our Common Diseases
Doane, Rennie Wilbur
7,358 Gutenberg downloadsen2009Difficulty 58 (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
7,351 Gutenberg downloadsen1999Difficulty 65 (Academic)
Sir Jagadis Chunder Bose, His Life and Speeches
Bose, Jagadis Chandra
7,236 Gutenberg downloadsen2007Difficulty 65 (Academic)
The Medicinal Plants of the Philippines
Pardo de Tavera, T. H. (Trinidad Hermenegildo)
6,736 Gutenberg downloadsen2008Difficulty 67 (Academic)
Darwin, and After Darwin, Volumes 1 and 3 An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions
Romanes, George John
6,543 Gutenberg downloadsen2008Difficulty 55 (Graduate)
Man And His Ancestor: A Study In Evolution
Morris, Charles
6,471 Gutenberg downloadsen2009Difficulty 58 (Graduate)
The Dawn of Reason; or, Mental Traits in the Lower Animals
Weir, James, Jr.
6,087 Gutenberg downloadsen2007Difficulty 70 (Academic)
Evolution in Modern Thought
Unknown
5,752 Gutenberg downloadsen2007Difficulty 73 (Expert)
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
5,550 Gutenberg downloadsen2009Difficulty 57 (Graduate)
Zoölogische Philosophie Of beschouwingen over de Natuurlijke Historie der dieren etc.
Lamarck, Jean Baptiste Pierre Antoine de Monet de
5,453 Gutenberg downloadsnl2008
The Stock-Feeder's Manual the chemistry of food in relation to the breeding and feeding of live stock
Cameron, Charles Alexander, Sir
5,048 Gutenberg downloadsen2008Difficulty 59 (Graduate)
An Elementary Study of Insects
Haseman, Leonard
4,957 Gutenberg downloadsen2007Difficulty 51 (Graduate)
Outlines of Dairy Bacteriology, 8th edition A Concise Manual for the Use of Students in Dairying
Russell, H. L. (Harry Luman)
4,836 Gutenberg downloadsen2009Difficulty 62 (Academic)
Freedom in Science and Teaching. from the German of Ernst Haeckel
Haeckel, Ernst
4,328 Gutenberg downloadsen2008Difficulty 73 (Expert)
Species Plantarum, Sections IV-V
Linné, Carl von
4,115 Gutenberg downloadsla2008
Explanation of Terms Used in Entomology
Smith, John Bernhard
3,995 Gutenberg downloadsen2007Difficulty 57 (Graduate)
The Foundations of the Origin of Species Two Essays written in 1842 and 1844
Darwin, Charles
3,727 Gutenberg downloadsen2007Difficulty 56 (Graduate)
Life and Matter: A Criticism of Professor Haeckel's "Riddle of the Universe"
Lodge, Oliver, Sir
3,417 Gutenberg downloadsen2008Difficulty 75 (Expert)
The Plants of Michigan Simple Keys for the Identification of the Native Seed Plants of the State
Gleason, Henry A. (Henry Allan)
3,257 Gutenberg downloadsen2010Difficulty 45 (College)
The Voyage of the Beagle
Darwin, Charles
3,016 Gutenberg downloadsen1997Difficulty 56 (Graduate)
The Genus Pinus
Shaw, George Russell
2,946 Gutenberg downloadsen2008Difficulty 58 (Graduate)
The Expression of the Emotions in Man and Animals
Darwin, Charles
2,899 Gutenberg downloadsen1998Difficulty 64 (Academic)
Are the Effects of Use and Disuse Inherited? An Examination of the View Held by Spencer and Darwin
Ball, W. P. (William Platt)
2,748 Gutenberg downloadsen2008Difficulty 68 (Academic)
Makers of British Botany; a collection of biographies by living botanists
Unknown
2,640 Gutenberg downloadsen2014Difficulty 61 (Academic)
Mental Evolution in Man: Origin of Human Faculty
Romanes, George John
2,543 Gutenberg downloadsen2015Difficulty 68 (Academic)
The Descent of Man, and Selection in Relation to Sex
Darwin, Charles
2,475 Gutenberg downloadsen2000Difficulty 69 (Academic)
Prof. Koch's Method to Cure Tuberculosis Popularly Treated
Birnbaum, Max
2,423 Gutenberg downloadsen2008Difficulty 59 (Graduate)
Rollo's Experiments
Abbott, Jacob
2,400 Gutenberg downloadsen2008Difficulty 35 (High School)
The Variation of Animals and Plants Under Domestication, Volume II (of 2)
Darwin, Charles
2,371 Gutenberg downloadsen2009Difficulty 73 (Expert)
Butterflies and Moths (British)
Furneaux, William S.
2,236 Gutenberg downloadsen2010Difficulty 44 (College)
On Growth and Form
Thompson, D'Arcy Wentworth
2,208 Gutenberg downloadsen2017Difficulty 53 (Graduate)
Identification of the Larger Fungi
Watling, Roy
1,894 Gutenberg downloadsen2019Difficulty 62 (Academic)
At the Deathbed of Darwinism: A Series of Papers
Dennert, Eberhard
1,865 Gutenberg downloadsen2007Difficulty 68 (Academic)
Herbal Simples Approved for Modern Uses of Cure
Fernie, William Thomas
1,843 Gutenberg downloadsen2006Difficulty 54 (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
1,794 Gutenberg downloadsen2025Difficulty 48 (College)
The reason why : $b a careful collection of many hundreds of reasons for things which, though generally believed, are imperfectly understood. A book of condensed scientific knowledge for the million
Philp, Robert Kemp
1,725 Gutenberg downloadsen2014Difficulty 86 (Specialist)
Aristotle's History of Animals In Ten Books
Aristotle
1,722 Gutenberg downloadsen2019Difficulty 55 (Graduate)
How to Use the Popular Science Library; History of Science; General Index
Serviss, Garrett Putman & Selwyn-Brown, Arthur
1,718 Gutenberg downloadsen2016Difficulty 64 (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
1,671 Gutenberg downloadsen2022Difficulty 66 (Academic)
The Evolution of Man
Haeckel, Ernst
1,620 Gutenberg downloadsen2005Difficulty 49 (College)
The Common Spiders of the United States
Emerton, J. H. (James Henry)
1,586 Gutenberg downloadsen2013Difficulty 45 (College)
Encyclopaedia Britannica, 11th Edition, "Echinoderma" to "Edward, prince of Wales" Volume 8, Slice 10
Various
1,575 Gutenberg downloadsen2011Difficulty 65 (Academic)
Snakes: Curiosities and Wonders of Serpent Life
Hopley, Catherine Cooper
1,554 Gutenberg downloadsen2016Difficulty 56 (Graduate)
Applied Eugenics
Popenoe, Paul & Johnson, Roswell H. (Roswell Hill)
1,533 Gutenberg downloadsen2006Difficulty 55 (Graduate)
The Natural History of Pliny, Volume 5 (of 6)
Pliny, the Elder
1,518 Gutenberg downloadsen2019Difficulty 50 (College)
Cave Hunting Researches on the evidence of caves respecting the early inhabitants of Europe
Dawkins, William Boyd
1,484 Gutenberg downloadsen2016Difficulty 77 (Expert)
The Biotic Associations of Cockroaches
Roth, Louis M. (Louis Marcus) & Willis, Edwin R.
1,484 Gutenberg downloadsen2014Difficulty 71 (Expert)
Lamarck, the Founder of Evolution: His Life and Work
Packard, A. S. (Alpheus Spring)
1,464 Gutenberg downloadsen2007Difficulty 58 (Graduate)
Fabre's Book of Insects
Fabre, Jean-Henri
1,451 Gutenberg downloadsen2021Difficulty 43 (College)
Encyclopaedia Britannica, 11th Edition, "Ichthyology" to "Independence" Volume 14, Slice 3
Various
1,446 Gutenberg downloadsen2012Difficulty 67 (Academic)
The Autobiography of Charles Darwin
Darwin, Charles
1,446 Gutenberg downloadsen1999Difficulty 53 (Graduate)
Handbook of Birmingham Prepared for the Members of the British Association, 1886
British Association for the Advancement of Science
1,428 Gutenberg downloadsen2015Difficulty 51 (Graduate)
The Story-book of Science
Fabre, Jean-Henri
1,386 Gutenberg downloadsen2018Difficulty 43 (College)
Micrographia Some Physiological Descriptions of Minute Bodies Made by Magnifying Glasses with Observations and Inquiries Thereupon
Hooke, Robert
1,379 Gutenberg downloadsen2005Difficulty 76 (Expert)
Life and Letters of Charles Darwin — Volume 2
Darwin, Charles
1,352 Gutenberg downloadsen2000Difficulty 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.
1,315 Gutenberg downloadsen2016Difficulty 54 (Graduate)
The Animal Parasites of Man
Fantham, Harold Benjamin & Braun, Max & Stephens, J. W. W. (John William Watson) & Theobald, Fred. V. (Frederick Vincent)
1,312 Gutenberg downloadsen2018Difficulty 67 (Academic)
Wild Flowers An Aid to Knowledge of Our Wild Flowers and Their Insect Visitors
Blanchan, Neltje
1,296 Gutenberg downloadsen2002Difficulty 58 (Graduate)
The Cambridge natural history, Vol. 06 (of 10)
Sharp, David
1,288 Gutenberg downloadsen2023Difficulty 65 (Academic)
The Prolongation of Life: Optimistic Studies
Metchnikoff, Elie
1,265 Gutenberg downloadsen2016Difficulty 58 (Graduate)
The Book of the Pearl The history, art, science, and industry of the queen of gems
Kunz, George Frederick & Stevenson, Charles Hugh
1,259 Gutenberg downloadsen2020Difficulty 64 (Academic)
The Power of Movement in Plants
Darwin, Charles & Darwin, Francis, Sir
1,241 Gutenberg downloadsen2004Difficulty 70 (Academic)
Proceedings of the California Academy of Sciences, Volume III, 1863-1867
Various
1,236 Gutenberg downloadsen2020Difficulty 58 (Graduate)
Darwin and Modern Science
Seward, A. C. (Albert Charles)
1,217 Gutenberg downloadsen1999Difficulty 56 (Graduate)
History of Botany (1530-1860)
Sachs, Julius
1,217 Gutenberg downloadsen2020Difficulty 72 (Expert)
Cosmos: A Sketch of the Physical Description of the Universe, Vol. 1
Humboldt, Alexander von
1,206 Gutenberg downloadsen2005Difficulty 67 (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)
1,204 Gutenberg downloadsen2021Difficulty 63 (Academic)
Lichens
Smith, Annie Lorrain
1,197 Gutenberg downloadsen2020Difficulty 52 (Graduate)
Encyclopaedia Britannica, 11th Edition, "Foraminifera" to "Fox, Edward" Volume 10, Slice 6
Various
1,193 Gutenberg downloadsen2011Difficulty 67 (Academic)
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
1,187 Gutenberg downloadsen2001Difficulty 63 (Academic)
A text-book of veterinary anatomy
Sisson, Septimus
1,184 Gutenberg downloadsen2025Difficulty 76 (Expert)
History of the Conflict Between Religion and Science
Draper, John William
1,183 Gutenberg downloadsen1998Difficulty 62 (Academic)
An essay towards a natural history of serpents
Owen, Charles
1,181 Gutenberg downloadsen2023Difficulty 49 (College)
The Descent of Man and Selection in Relation to Sex, Vol. I
Darwin, Charles
1,174 Gutenberg downloadsen2011Difficulty 65 (Academic)
Clever Hans (The Horse of Mr. Von Osten) A contribution to experimental animal and human psychology
Pfungst, Oskar
1,171 Gutenberg downloadsen2010Difficulty 57 (Graduate)
Beginners' botany
Bailey, L. H. (Liberty Hyde)
1,144 Gutenberg downloadsen2024Difficulty 50 (College)
The Life of the Bee
Maeterlinck, Maurice
1,143 Gutenberg downloadsen2003Difficulty 60 (Graduate)
The Journal of a Disappointed Man
Barbellion, W. N. P.
1,112 Gutenberg downloadsen2012Difficulty 42 (College)
Encyclopaedia Britannica, 11th Edition, "Matter" to "Mecklenburg" Volume 17, Slice 8
Various
1,104 Gutenberg downloadsen2013Difficulty 71 (Expert)
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
1,104 Gutenberg downloadsen2003Difficulty 66 (Academic)
Origin of Cultivated Plants The International Scientific Series Volume XLVIII
Candolle, Alphonse de
1,080 Gutenberg downloadsen2014Difficulty 62 (Academic)
Mammals of Washington, Volume 2 University of Kansas Publications Museum of Natural History
Dalquest, Walter Woelber
1,076 Gutenberg downloadsen2016Difficulty 52 (Graduate)
Insectivorous Plants
Darwin, Charles
1,069 Gutenberg downloadsen2004Difficulty 63 (Academic)
The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told
Thomson, J. Arthur (John Arthur)
1,062 Gutenberg downloadsen2007Difficulty 66 (Academic)
The Principles of Biology, Volume 1 (of 2)
Spencer, Herbert
1,057 Gutenberg downloadsen2017Difficulty 63 (Academic)
Sex-linked Inheritance in Drosophila
Morgan, Thomas Hunt & Bridges, Calvin B. (Calvin Blackman)
1,054 Gutenberg downloadsen2010Difficulty 60 (Graduate)
The Snakes of Europe
Boulenger, George Albert
1,042 Gutenberg downloadsen2014Difficulty 63 (Academic)
Australian insects
Froggatt, Walter W. (Walter Wilson)
1,037 Gutenberg downloadsen2025Difficulty 52 (Graduate)
Research methods in ecology
Clements, Frederic E. (Frederic Edward)
1,024 Gutenberg downloadsen2024Difficulty 50 (College)
A century of science in America : $b with special reference to the American Journal of Science, 1818-1918
Unknown
1,021 Gutenberg downloadsen2024Difficulty 60 (Graduate)
Mutual Aid: A Factor of Evolution
Kropotkin, Petr Alekseevich, kniaz
1,020 Gutenberg downloadsen2003Difficulty 73 (Expert)
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
1,017 Gutenberg downloadsen2022Difficulty 87 (Specialist)
The Cambridge natural history, Vol. 03 (of 10)
Cooke, A. H. (Alfred Hands) & Reed, F. R. C. (Frederick Richard Cowper)
1,015 Gutenberg downloadsen2023Difficulty 63 (Academic)
More Letters of Charles Darwin — Volume 2 A Record of His Work in a Series of Hitherto Unpublished Letters
Darwin, Charles
1,013 Gutenberg downloadsen2001Difficulty 50 (College)
Fungi: Their Nature and Uses
Cooke, M. C. (Mordecai Cubitt)
1,011 Gutenberg downloadsen2009Difficulty 57 (Graduate)
Taboo and genetics : $b A study of the biological, sociological and psychological foundation of the family
Knight, Melvin M. (Melvin Moses) & Blanchard, Phyllis & Peters, Iva Lowther
992 Gutenberg downloadsen2004Difficulty 61 (Academic)
The Naturalist on the River Amazons
Bates, Henry Walter
992 Gutenberg downloadsen2000Difficulty 67 (Academic)
Artistic Anatomy of Animals
Cuyer, Édouard
989 Gutenberg downloadsen2011Difficulty 54 (Graduate)
Cassell's Natural History, Vol. 2 (of 6)
Unknown
989 Gutenberg downloadsen2019Difficulty 99 (Quantum Electrodynamics)
Tobacco; Its History, Varieties, Culture, Manufacture and Commerce
Billings, E. R.
987 Gutenberg downloadsen2008Difficulty 59 (Graduate)
Bramble-Bees and Others
Fabre, Jean-Henri
985 Gutenberg downloadsen2002Difficulty 52 (Graduate)
Sketches of the Natural History of Ceylon
Tennent, James Emerson, Sir
979 Gutenberg downloadsen2004Difficulty 72 (Expert)
Reptiles and Birds A Popular Account of Their Various Orders, With a Description of the Habits and Economy of the Most Interesting
Figuier, Louis
977 Gutenberg downloadsen2014Difficulty 79 (Expert)
The Cambridge natural history, Vol. 09 (of 10)
Evans, A. H. (Arthur Humble)
977 Gutenberg downloadsen2024Difficulty 59 (Graduate)
Himalayan Journals — Complete Or, Notes of a Naturalist in Bengal, the Sikkim and Nepal Himalayas, the Khasia Mountains, etc.
Hooker, Joseph Dalton
971 Gutenberg downloadsen2004Difficulty 99 (Quantum Electrodynamics)
Form and Function: A Contribution to the History of Animal Morphology
Russell, E. S. (Edward Stuart)
968 Gutenberg downloadsen2007Difficulty 59 (Graduate)
The Formation of Vegetable Mould Through the Action of Worms With Observations on Their Habits
Darwin, Charles
961 Gutenberg downloadsen2000Difficulty 63 (Academic)
Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1
Humboldt, Alexander von & Bonpland, Aimé
959 Gutenberg downloadsen2004Difficulty 55 (Graduate)
The Cambridge natural history, Vol. 08 (of 10)
Gadow, Hans
959 Gutenberg downloadsen2024Difficulty 63 (Academic)
Reflections on the Decline of Science in England, and on Some of Its Causes
Babbage, Charles
958 Gutenberg downloadsen1998Difficulty 63 (Academic)
Galen: On the Natural Faculties
Galen
957 Gutenberg downloadsen2013Difficulty 65 (Academic)
The Life of the Spider
Fabre, Jean-Henri
956 Gutenberg downloadsen1999Difficulty 52 (Graduate)
The grapes of New York
Hedrick, U. P.
951 Gutenberg downloadsen2014Difficulty 63 (Academic)
Evidence as to Man's Place in Nature
Huxley, Thomas Henry
948 Gutenberg downloadsen2001Difficulty 56 (Graduate)
The Science of Fingerprints: Classification and Uses
United States. Federal Bureau of Investigation
947 Gutenberg downloadsen2006Difficulty 61 (Academic)
The Mason-Wasps
Fabre, Jean-Henri
946 Gutenberg downloadsen2021Difficulty 50 (College)
The Cambridge natural history, Vol. 01 (of 10)
Hartog, Marcus & Hickson, Sydney J. (Sydney John) & MacBride, E. W. (Ernest William) & Sollas, Igerna Brünhilda Johnson
944 Gutenberg downloadsen2023Difficulty 71 (Expert)
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
938 Gutenberg downloadsen2014Difficulty 55 (Graduate)
Charles Darwin: His Life Told in an Autobiographical Chapter, and in a Selected Series of His Published Letters
Darwin, Charles
935 Gutenberg downloadsen2012Difficulty 53 (Graduate)
Butterflies Worth Knowing
Weed, Clarence Moores
929 Gutenberg downloadsen2011Difficulty 66 (Academic)
Elements of Structural and Systematic Botany For High Schools and Elementary College Courses
Campbell, Douglas Houghton
928 Gutenberg downloadsen2007Difficulty 57 (Graduate)
The Microscope. Its History, Construction, and Application 15th ed. Being a familiar introduction to the use of the instrument, and the study of microscopical science
Hogg, Jabez
923 Gutenberg downloadsen2020Difficulty 67 (Academic)
A Guide to the Study of Fishes, Volume 2 (of 2)
Jordan, David Starr
920 Gutenberg downloadsen2016Difficulty 83 (Specialist)
Studies in the History and Method of Science, vol. 1 (of 2)
Unknown
919 Gutenberg downloadsen2014Difficulty 57 (Graduate)
Fossil plants, Vol. 1 : $b [A text-book] for students of botany and geology
Seward, A. C. (Albert Charles)
917 Gutenberg downloadsen2022Difficulty 57 (Graduate)
Thomas Henry Huxley; A Sketch Of His Life And Work
Mitchell, P. Chalmers (Peter Chalmers), Sir
916 Gutenberg downloadsen2005Difficulty 68 (Academic)
Manual of the Trees of North America (Exclusive of Mexico) 2nd ed.
Sargent, Charles Sprague
914 Gutenberg downloadsen2014Difficulty 78 (Expert)
The Cambridge natural history, Vol. 10 (of 10)
Beddard, Frank E. (Frank Evers)
913 Gutenberg downloadsen2012Difficulty 61 (Academic)
Woman in Science With an Introductory Chapter on Woman's Long Struggle for Things of the Mind
Zahm, J. A. (John Augustine)
908 Gutenberg downloadsen2011Difficulty 66 (Academic)
The Variation of Animals and Plants under Domestication
Darwin, Charles
907 Gutenberg downloadsen2002Difficulty 86 (Specialist)
Life histories of North American woodpeckers
Bent, Arthur Cleveland
904 Gutenberg downloadsen2024Difficulty 65 (Academic)
The life of Jean Henri Fabre, the entomologist, 1823-1910
Fabre, Augustin
904 Gutenberg downloadsen2024Difficulty 58 (Graduate)
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
903 Gutenberg downloadsen2019Difficulty 68 (Academic)
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)
902 Gutenberg downloadsen2009Difficulty 47 (College)
Insect Architecture
Rennie, James
899 Gutenberg downloadsen2014Difficulty 50 (College)
The Life of Crustacea
Calman, W. T. (William Thomas)
899 Gutenberg downloadsen2012Difficulty 51 (Graduate)
The human species
Quatrefages, A. de (Armand de)
897 Gutenberg downloadsen2023Difficulty 56 (Graduate)
Nature's Teachings: Human Invention Anticipated by Nature
Wood, J. G. (John George)
896 Gutenberg downloadsen2016Difficulty 51 (Graduate)
The Evolution Theory, Vol. 1 of 2
Weismann, August
893 Gutenberg downloadsen2021Difficulty 59 (Graduate)
A History of North American Birds; Land Birds; Vol. 3 of 3
Baird, Spencer Fullerton & Brewer, T. M. (Thomas Mayo) & Ridgway, Robert
889 Gutenberg downloadsen2017Difficulty 59 (Graduate)
Handbook of Medical Entomology
Riley, William A. (William Albert) & Johannsen, O. A. (Oskar Augustus)
883 Gutenberg downloadsen2010Difficulty 57 (Graduate)
The Life of the Grasshopper
Fabre, Jean-Henri
883 Gutenberg downloadsen2021Difficulty 51 (Graduate)
Cassell's book of birds; vol. 3
Brehm, Alfred Edmund
881 Gutenberg downloadsen2019Difficulty 62 (Academic)
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
879 Gutenberg downloadsen2017Difficulty 62 (Academic)
Le monde de la mer
Moquin-Tandon, Alfred
876 Gutenberg downloadsfr2023
The Moths of the British Isles, First Series Comprising the Families Sphingidæ to Noctuidæ
South, Richard
876 Gutenberg downloadsen2013Difficulty 54 (Graduate)
Cassell's Natural History, Vol. 1 (of 6)
Unknown
875 Gutenberg downloadsen2017Difficulty 94 (Quantum Electrodynamics)
Index of the Project Gutenberg Works of Charles Darwin
Darwin, Charles
875 Gutenberg downloadsen2019Difficulty 88 (Specialist)
Louis Agassiz: His Life and Correspondence
Agassiz, Louis
873 Gutenberg downloadsen2004Difficulty 49 (College)
American Pomology. Apples
Warder, J. A. (John Aston)
868 Gutenberg downloadsen2011Difficulty 64 (Academic)
The Life of the Fly; With Which are Interspersed Some Chapters of Autobiography
Fabre, Jean-Henri
868 Gutenberg downloadsen2002Difficulty 54 (Graduate)
Inquiries into human faculty and its development
Galton, Francis
865 Gutenberg downloadsen2004Difficulty 79 (Expert)
Botany: The Science of Plant Life
Taylor, Norman
862 Gutenberg downloadsen2015Difficulty 56 (Graduate)
The Butterfly Book A Popular Guide to a Knowledge of the Butterflies of North America
Holland, W. J. (William Jacob)
862 Gutenberg downloadsen2012Difficulty 55 (Graduate)
The Nature of Animal Light
Harvey, E. Newton (Edmund Newton)
862 Gutenberg downloadsen2010Difficulty 71 (Expert)
Zoonomia; Or, the Laws of Organic Life, Vol. I
Darwin, Erasmus
862 Gutenberg downloadsen2005Difficulty 64 (Academic)
Encyclopaedia Britannica, 11th Edition, "Joints" to "Justinian I." Volume 15, Slice 5
Various
860 Gutenberg downloadsen2012Difficulty 65 (Academic)
Bacteria Especially as they are related to the economy of nature, to industrial processes, and to the public health
Newman, George, Sir
855 Gutenberg downloadsen2015Difficulty 66 (Academic)
Parasites: A Treatise on the Entozoa of Man and Animals Including Some Account of the Ectozoa
Cobbold, T. Spencer (Thomas Spencer)
854 Gutenberg downloadsen2014Difficulty 60 (Graduate)
A Text-Book of Horseshoeing, for Horseshoers and Veterinarians
Lungwitz, A. (Anton)
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A Monograph on the Sub-class Cirripedia (Volume 1 of 2) The Lepadidae; Or, Pedunculated Cirripedes
Darwin, Charles
852 Gutenberg downloadsen2010Difficulty 59 (Graduate)
A History of North American Birds; Land Birds; Vol. 2 of 3
Baird, Spencer Fullerton & Brewer, T. M. (Thomas Mayo) & Ridgway, Robert
845 Gutenberg downloadsen2017Difficulty 46 (College)
Histoire des légumes
Gibault, Georges
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Narrative of the Circumnavigation of the Globe by the Austrian Frigate Novara, Volume II (Commodore B. Von Wullerstorf-Urbair,) Undertaken by Order of the Imperial Government in the Years 1857, 1858, & 1859, Under the Immediate Auspices of His I. and R. Highness the Archduke Ferdinand Maximilian, Commander-In-Chief of the Austrian Navy.
Scherzer, Karl, Ritter von
840 Gutenberg downloadsen2012Difficulty 56 (Graduate)
Unconscious Memory
Butler, Samuel
840 Gutenberg downloadsen2004Difficulty 64 (Academic)
Zoölogy: The Science of Animal Life Popular Science Library, Volume XII (of 16), P. F. Collier & Son Company, 1922
Ingersoll, Ernest
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Letters of Asa Gray; Vol. 1
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Nature readers : $b Sea-side and way-side. No. 4
Wright, Julia McNair
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A History of Science — Volume 4
Williams, Henry Smith & Williams, Edward Huntington
834 Gutenberg downloadsen1999Difficulty 68 (Academic)
The Cambridge natural history, Vol. 07 (of 10)
Boulenger, George Albert & Bridge, T. W. (Thomas William) & Herdman, W. A. (William Abbott), Sir
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Domestic Animals History and description of the horse, mule, cattle, sheep, swine, poultry and farm dogs; with directions for their management, breeding, crossing, rearing, feeding, and preparation for a profitable market; also their diseases and remedies. Together with full directions for the management of the dairy.
Allen, Richard Lamb
830 Gutenberg downloadsen2010Difficulty 72 (Expert)
Man, Past and Present
Keane, A. H. (Augustus Henry)
830 Gutenberg downloadsen2011Difficulty 60 (Graduate)
The Progress of the Century
Unknown
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Extinct Monsters A Popular Account of Some of the Larger Forms of Ancient Animal Life
Hutchinson, H. N. (Henry Neville)
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The flowering plants of Africa An analytical key to the genera of African phanerograms
Thonner, Franz
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Haeckel, Ernst
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American Forest Trees
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Vestiges of the Natural History of Creation
Chambers, Robert
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Life History and Ecology of the Five-Lined Skink, Eumeces fasciatus
Fitch, Henry S. (Henry Sheldon)
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Structure and Functions of the Body A Hand-Book of Anatomy and Physiology for Nurses and Others Desiring a Practical Knowledge of the Subject
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The Cambridge natural history, Vol. 02 (of 10)
Beddard, Frank E. (Frank Evers) & Benham, W. B. (William Blaxland) & Gamble, F. W. (Frederick William) & Hartog, Marcus & Sheldon, Lilian
813 Gutenberg downloadsen2023Difficulty 74 (Expert)
Syndrome
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812 Gutenberg downloadsen2010Difficulty 42 (College)
Life histories of North American shore birds, Part 1 (of 2)
Bent, Arthur Cleveland
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Science & Education: Essays
Huxley, Thomas Henry
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The Cambridge natural history, Vol. 05 (of 10)
Sedgwick, Adam & Sharp, David & Sinclair, F. G. (Frederick Granville)
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The Dog
Youatt, William
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A History of Science — Volume 2
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799 Gutenberg downloadsen1999Difficulty 63 (Academic)
Metabolic Adaptation to Climate and Distribution of the Raccoon Procyon Lotor and Other Procyonidae
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Autobiography and Selected Essays
Huxley, Thomas Henry
798 Gutenberg downloadsen2006Difficulty 54 (Graduate)
Cassell's book of birds; vol. 4
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798 Gutenberg downloadsen2022Difficulty 58 (Graduate)
General Anatomy, Applied to Physiology and Medicine, Vol. 3 (of 3)
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798 Gutenberg downloadsen2018Difficulty 61 (Academic)
Bass, Pike, Perch, and Others
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The Arctic World : $b Its plants, animals, and natural phenomena. With a historical sketch of Arctic discovery, down to the British polar expedition: 1875-76.
Anonymous
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The Chemistry of Plant Life
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791 Gutenberg downloadsen2010Difficulty 88 (Specialist)
Life and death
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Hedrick, U. P.
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The Physical Basis of Mind Being the Second Series of Problems of Life and Mind.
Lewes, George Henry
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The Geological History of Plants
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Essays Upon Heredity and Kindred Biological Problems Authorised Translation
Weismann, August
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Venoms: Venomous Animals and Antivenomous Serum-therapeutics
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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
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The Sea-beach at Ebb-tide A Guide to the Study of the Seaweeds and the Lower Animal Life Found Between Tide-marks
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The Butterflies of the British Isles
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Life Movements in Plants, Volume II
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781 Gutenberg downloadsen2012Difficulty 73 (Expert)
The Works of William Harvey M.D. Translated from the Latin with a life of the author
Harvey, William
780 Gutenberg downloadsen2019Difficulty 66 (Academic)
The book of antelopes, vol. 1 (of 4)
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Insect life: Souvenirs of a naturalist
Fabre, Jean-Henri
777 Gutenberg downloadsen2022Difficulty 51 (Graduate)
The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science
Nicholson, Henry Alleyne
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Falling in Love; With Other Essays on More Exact Branches of Science
Allen, Grant
775 Gutenberg downloadsen2005Difficulty 64 (Academic)
The Riddle of the Universe at the close of the nineteenth century
Haeckel, Ernst
774 Gutenberg downloadsen2013Difficulty 72 (Expert)
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772 Gutenberg downloadsen2023Difficulty 65 (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
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The Principles of Biology, Volume 2 (of 2)
Spencer, Herbert
770 Gutenberg downloadsen2022Difficulty 63 (Academic)
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769 Gutenberg downloadsen2013Difficulty 52 (Graduate)
L'Afrique centrale française : $b Récit du voyage de la mission
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Anatomy of the Cat
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761 Gutenberg downloadsen2018Difficulty 52 (Graduate)
Response in the Living and Non-Living
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761 Gutenberg downloadsen2006Difficulty 65 (Academic)
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759 Gutenberg downloadsen2013Difficulty 63 (Academic)
The Vertebrate Skeleton
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759 Gutenberg downloadsen2013Difficulty 64 (Academic)
A History of Science — Volume 1
Williams, Henry Smith & Williams, Edward Huntington
758 Gutenberg downloadsen1999Difficulty 65 (Academic)
The Chain of Life in Geological Time A Sketch of the Origin and Succession of Animals and Plants
Dawson, John William, Sir
758 Gutenberg downloadsen2011Difficulty 56 (Graduate)
The Story of Evolution
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The romance of insect life : $b Interesting descriptions of the strange and curious in the insect world
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Problems of Genetics
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The Effects of Cross & Self-Fertilisation in the Vegetable Kingdom
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Text book of veterinary medicine, Volume 3 (of 5)
Law, James
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A system of practical medicine. By American authors. Vol. 1 : $b Pathology and general diseases
Unknown
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Social Life in the Insect World
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The Organism as a Whole, from a Physicochemical Viewpoint
Loeb, Jacques
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Appletons' Popular Science Monthly, July 1899 Volume LV, No. 3, July 1899
Various
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General Anatomy, Applied to Physiology and Medicine, Vol. 2 (of 3)
Bichat, Xavier
745 Gutenberg downloadsen2017Difficulty 61 (Academic)
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Smith, Geoffrey & Thompson, D'Arcy Wentworth & Warburton, Cecil & Weldon, Walter Frank Raphael & Woods, Henry
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The heart of Africa, Vol. 1 (of 2)
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The Botanical Magazine, Vol. 07 Or, Flower-Garden Displayed
Curtis, William
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A History of North American Birds; Land Birds; Vol. 1 of 3
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British Bees An Introduction into the Studies of the Natural History and Economy of the Bees Indigenous to the British Isles
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Relics of Primeval Life: Beginning of Life in the Dawn of Geological Time
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The Farmer's Veterinarian: A Practical Treatise on the Diseases of Farm Stock
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The plums of New York
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Everyday Objects; Or, Picturesque Aspects of Natural History.
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735 Gutenberg downloadsen2014Difficulty 57 (Graduate)
Animal Life and Intelligence
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Glimpses of Ocean Life; Or, Rock-Pools and the Lessons they Teach
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Alfred Russel Wallace: Letters and Reminiscences, Vol. 1
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Fossil plants, Vol. 2 : $b A text-book for students of botany and geology
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Species and Varieties, Their Origin by Mutation
Vries, Hugo de
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Darwinism (1889) An exposition of the theory of natural selection, with some of its applications
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Elements of Physiophilosophy
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Journals of Travels in Assam, Burma, Bhootan, Afghanistan and the Neighbouring Countries
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Life and Letters of Thomas Henry Huxley — Volume 3
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Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)
Burkett, Ray D.
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Eleanor Ormerod, LL. D., Economic Entomologist : Autobiography and Correspondence
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General Anatomy, Applied to Physiology and Medicine, Vol. 1 (of 3)
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Science from an Easy Chair
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The Minds and Manners of Wild Animals: A Book of Personal Observations
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Woman and Womanhood: A Search for Principles
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The Geographical Distribution of Animals, Volume 1 With a study of the relations of living and extinct faunas as elucidating the past changes of the Earth's surface
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Forest Trees of Texas: How to Know Them
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Observations of a Naturalist in the Pacific Between 1896 and 1899, Volume 2 Plant-Dispersal
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The Wonders of Instinct: Chapters in the Psychology of Insects
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Extinct birds : $b An attempt to unite in one volume a short account of those birds which have become extinct in historical times
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Scientific American Supplement, No. 841, February 13, 1892
Various
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An Inquiry into the Causes and Effects of the Variolae Vaccinae A Disease Discovered in Some of the Western Counties of England, Particularly Gloucestershire, and Known by the Name of the Cow Pox
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The useful trees of northern Nigeria
Lely, Hugh Vandervaes
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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
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The Elements of Botany, For Beginners and For Schools
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The Glands Regulating Personality A Study of the Glands of Internal Secretion in Relation to the Types of Human Nature
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Antarctic Penguins: A Study of Their Social Habits
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713 Gutenberg downloadsen2022Difficulty 69 (Academic)
Handbook of the Trees of New England
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The Pleistocene of North America and its vertebrated animals from the states east of the Mississippi River and from the Canadian provinces east of longitude 95°
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Fishing Grounds of the Gulf of Maine
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The Evolution of Marriage and of the Family
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A Report upon the Mollusk Fisheries of Massachusetts
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Pioneers of Evolution from Thales to Huxley With an Intermediate Chapter on the Causes of Arrest of the Movement
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Essays: Scientific, Political, & Speculative; Vol. 1 of 3 Library Edition (1891), Containing Seven Essays not before Republished, and Various other Additions.
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Scurvy, Past and Present
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Trees of the Northern United States Their Study, Description and Determination
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Monism as Connecting Religion and Science A Man of Science
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698 Gutenberg downloadsen2003Difficulty 62 (Academic)
The botanist's repository for new and rare plants; vol. 01 & 02 [of 10]
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An Introduction to Entomology: Vol. 3 or Elements of the Natural History of the Insects
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Life histories of North American wood warblers, Part 1 (of 2)
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The Harvest of the Sea A contribution to the natural and economic history of the British food fishes
Bertram, James Glass
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The North American Slime-Moulds A Descriptive List of All Species of Myxomycetes Hitherto Reported from the Continent of North America, with Notes on Some Extra-Limital Species
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693 Gutenberg downloadsen2010Difficulty 63 (Academic)
Harvey's Views on the Use of the Circulation of the Blood
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The History of Creation, Vol. 2 (of 2) Or the Development of the Earth and its Inhabitants by the Action of Natural Causes
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The Sea and Its Living Wonders A Popular Account of the Marvels of the Deep and of the Progress of Martime Discovery from the Earliest Ages to the Present Time
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The Moths of the British Isles, Second Series Comprising the Families Noctuidæ to Hepialidæ
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The Life-Story of Insects
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Unknown
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Speciation in the Brazilian Spiny Rats
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679 Gutenberg downloadsen2013Difficulty 70 (Academic)
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The Romance of the Microscope 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
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674 Gutenberg downloadsen2011Difficulty 62 (Academic)
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Hutchison, Joseph C. (Joseph Chrisman)
671 Gutenberg downloadsen2010Difficulty 53 (Graduate)
Journal of the Proceedings of the Linnean Society - Vol. 4 Zoology
Linnean Society of London
671 Gutenberg downloadsen2014Difficulty 61 (Academic)
Special report on diseases of cattle
United States. Bureau of Animal Industry & Atkinson, V. T. (Vickers T.) & Dickson, Dr. (William) & Eichhorn, A. (Adolph) & Hickman, Richard W. (Richard West) & Law, James & Lowe, (Dr.) (William Herbert) & Marsh, C. Dwight (Charles Dwight) & Mohler, John R. (John Robbins) & Murray, A. J. (Alexander James) & Pearson, Leonard & Ransom, Brayton Howard & Trumbower, M. R. (Milton R.) & Woodward, Dr. (Benjamin Tilghman)
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The Botanical Magazine, Vol. 06 Or, Flower-Garden Displayed
Curtis, William
668 Gutenberg downloadsen2007Difficulty 60 (Graduate)
Elementary Zoology, Second Edition
Kellogg, Vernon L. (Vernon Lyman)
667 Gutenberg downloadsen2012Difficulty 57 (Graduate)
Birds useful and birds harmful
Herman, Ottó & Owen, J. A. (Jean Allan)
666 Gutenberg downloadsen2016Difficulty 56 (Graduate)
Essays on the Microscope Containing a Practical Description of the Most Improved Microscopes, a General History of Insects, etc., etc.
Adams, George
666 Gutenberg downloadsen2020Difficulty 62 (Academic)
The Child's Book of Nature Three parts in one
Hooker, Worthington
666 Gutenberg downloadsen2018Difficulty 36 (High School)
The Descent of Man and Selection in Relation to Sex, Vol. II (1st Edition)
Darwin, Charles
666 Gutenberg downloadsen2011Difficulty 59 (Graduate)
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Fabre, Jean-Henri
666 Gutenberg downloadsen2021Difficulty 51 (Graduate)
Darwin
Bradford, Gamaliel
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Field, Forest and Farm Things interesting to young nature-lovers, including some matters of moment to gardeners and fruit-growers
Fabre, Jean-Henri
665 Gutenberg downloadsen2022Difficulty 54 (Graduate)
Glaucus; Or, The Wonders of the Shore
Kingsley, Charles
665 Gutenberg downloadsen1996Difficulty 57 (Graduate)
Lives of Eminent Zoologists, from Aristotle to Linnæus with Introductory remarks on the Study of Natural History
MacGillivray, William
664 Gutenberg downloadsen2010Difficulty 84 (Specialist)
The anatomy of the domestic fowl
Kaupp, B. F. (Benjamin Franklyn)
661 Gutenberg downloadsen2023Difficulty 65 (Academic)
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Olin, George
660 Gutenberg downloadsen2016Difficulty 57 (Graduate)
The book of antelopes, vol. 4 (of 4)
Sclater, Philip Lutley & Thomas, Oldfield
660 Gutenberg downloadsen2023Difficulty 48 (College)
Man's Place in Nature, and Other Essays
Huxley, Thomas Henry
659 Gutenberg downloadsen2012Difficulty 65 (Academic)
On Molecular and Microscopic Science, Volume 2 (of 2)
Somerville, Mary
658 Gutenberg downloadsen2018Difficulty 58 (Graduate)
Het Leven der Dieren: Deel 3.7, De Weekdieren
Brehm, Alfred Edmund
655 Gutenberg downloadsnl2020
Life and Letters of Thomas Henry Huxley — Volume 1
Huxley, Thomas Henry
655 Gutenberg downloadsen2004Difficulty 58 (Graduate)
Studies in the Theory of Descent (Volumes 1 and 2)
Weismann, August
655 Gutenberg downloadsen2015Difficulty 68 (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
655 Gutenberg downloadsen2022Difficulty 53 (Graduate)
The Monist, Vol. 1, 1890-1891 : $b A quarterly magazine
Various
655 Gutenberg downloadsen2018Difficulty 64 (Academic)
The Variation of Animals and Plants under Domestication — Volume 2
Darwin, Charles
654 Gutenberg downloadsen2001Difficulty 72 (Expert)
Mental Radio
Sinclair, Upton
653 Gutenberg downloadsen2020Difficulty 52 (Graduate)
The micro-organisms of the soil
Russell, Edward J. (Edward John) & Rothamsted Experimental Station
652 Gutenberg downloadsen2022Difficulty 62 (Academic)
Wayside and woodland trees : $b a pocket guide to the British sylva
Step, Edward
652 Gutenberg downloadsen2010Difficulty 53 (Graduate)
Animal Locomotion; or, walking, swimming, and flying With a dissertation on aëronautics
Pettigrew, James Bell
651 Gutenberg downloadsen2018Difficulty 66 (Academic)
Being Well-Born: An Introduction to Eugenics
Guyer, Michael F. (Michael Frederic)
651 Gutenberg downloadsen2012Difficulty 85 (Specialist)
A Guide to the Study of Fishes, Volume 1 (of 2)
Jordan, David Starr
650 Gutenberg downloadsen2014Difficulty 66 (Academic)
Text book of veterinary medicine, Volume 4 (of 5)
Law, James
650 Gutenberg downloadsen2024Difficulty 69 (Academic)
The Edinburgh New Philosophical Journal, Vol. XLIX April-October 1850
Various
649 Gutenberg downloadsen2013Difficulty 66 (Academic)
The works of Francis Maitland Balfour, Volume 3 (of 4) : $b A treatise on comparative embryology: Vertebrata
Balfour, Francis M. (Francis Maitland)
649 Gutenberg downloadsen2014Difficulty 54 (Graduate)
Through a pocket lens
Scherren, Henry
649 Gutenberg downloadsen2022Difficulty 43 (College)
Fossil plants, Vol. 3 : $b A text-book for students of botany and geology
Seward, A. C. (Albert Charles)
648 Gutenberg downloadsen2025Difficulty 64 (Academic)
New Zealand Moths and Butterflies (Macro-Lepidoptera)
Hudson, G. V. (George Vernon)
648 Gutenberg downloadsen2013Difficulty 60 (Graduate)
The Popular Science Monthly, September, 1900 Vol. 57, May, 1900 to October, 1900
Various
648 Gutenberg downloadsen2014Difficulty 77 (Expert)
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Various
647 Gutenberg downloadsen2013Difficulty 54 (Graduate)
The ivory king : $b A popular history of the elephant and its allies
Holder, Charles Frederick
647 Gutenberg downloadsen2021Difficulty 54 (Graduate)
The Romance of Plant Life Interesting Descriptions of the Strange and Curious in the Plant World
Elliot, G. F. Scott (George Francis Scott)
647 Gutenberg downloadsen2014Difficulty 71 (Expert)
Argentine Ornithology, Volume 2 (of 2) A descriptive catalogue of the birds of the Argentine Republic.
Sclater, Philip Lutley & Hudson, W. H. (William Henry)
646 Gutenberg downloadsen2012Difficulty 56 (Graduate)
Philosophical transactions, Vol. L. Part I. For the year 1757. 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)
646 Gutenberg downloadsen2021Difficulty 49 (College)
The Coming of Evolution: The Story of a Great Revolution in Science
Judd, John W. (John Wesley)
646 Gutenberg downloadsen2010Difficulty 68 (Academic)
The Lives of Celebrated Travellers, Vol. 2 (of 3)
St. John, James Augustus
646 Gutenberg downloadsen2021Difficulty 90 (Specialist)
A Natural History for Young People: Our Animal Friends in Their Native Homes including mammals, birds and fishes
Humphreys, Phebe Westcott
645 Gutenberg downloadsen2015Difficulty 63 (Academic)
The cherries of New York
Hedrick, U. P.
645 Gutenberg downloadsen2014Difficulty 67 (Academic)
The Natural History of Cage Birds Their Management, Habits, Food, Diseases, Treatment, Breeding, and the Methods of Catching Them.
Bechstein, Johann Matthäus
644 Gutenberg downloadsen2012Difficulty 56 (Graduate)
North American Jumping Mice (Genus Zapus)
Krutzsch, Philip H. (Philip Henry)
640 Gutenberg downloadsen2012Difficulty 64 (Academic)
The Mechanism of Life
Leduc, Stéphane
640 Gutenberg downloadsen2010Difficulty 63 (Academic)
Handbuch der Pharmakognosie : $b Zweiter Band. Spezielle Pharmakognosie
Tschirch, A. (Alexander)
638 Gutenberg downloadsde2023
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Miall, L. C. (Louis Compton)
638 Gutenberg downloadsen2018Difficulty 61 (Academic)
William Harvey and the Discovery of the Circulation of the Blood
Huxley, Thomas Henry
638 Gutenberg downloadsen2001Difficulty 62 (Academic)
A History of Science — Volume 5
Williams, Henry Smith & Williams, Edward Huntington
637 Gutenberg downloadsen2009Difficulty 57 (Graduate)
Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, Plates Report on the Scientific Results of the Voyage of H.M.S. Challenger During the Years 1873-76, Vol. XVIII
Haeckel, Ernst
636 Gutenberg downloadsen2013Difficulty 53 (Graduate)
Mr. Ray's travels, Vol. 2 : $b A collection of curious travels and voyages. Containing Dr Leonhart Rauwolf's journey into the eastern countries, viz. Syria, Palestine, or the Holy Land, Armenia, Mesopotamia, Assyria, Chaldea, &c., translated from the Original High Dutch, by Nicholas Staphorst. And also, travels into Greece, Asia minor, Egypt, Arabia felix, Petræa, Ethiopia, the Red Sea, &c. Collected from the observations of Mons. Belon, Prosper Alpinus, Dr. Huntington, Mr. Vernon, Sir George Wheeler, Dr. Smith, Mr. Greaves, and others. To which are added three catalogues of such trees, shrubs, and herbs, as grow in the Levant. By the Rev. John Ray, F.R.S.
Ray, John & Rauwolf, Leonhard
635 Gutenberg downloadsen2025Difficulty 57 (Graduate)
Drawings and Pharmacy in Al-Zahrawi's 10th-Century Surgical Treatise
Hamarneh, Sami Khalaf
634 Gutenberg downloadsen2008Difficulty 62 (Academic)
Every Girl's Book
Butler, George Frank
634 Gutenberg downloadsen2009Difficulty 41 (College)
Poisonous Snakes of Texas and First Aid Treatment of Their Bites Bulletin No. 31
Werler, John E.
634 Gutenberg downloadsen2017Difficulty 58 (Graduate)
Animal Life in Field and Garden
Fabre, Jean-Henri
633 Gutenberg downloadsen2021Difficulty 47 (College)
Aspects of nature, in different lands and different climates (Vol. 2 of 2) with scientific elucidations
Humboldt, Alexander von
633 Gutenberg downloadsen2022Difficulty 72 (Expert)
Cassell's Natural History, Vol. 3 (of 6)
Unknown
633 Gutenberg downloadsen2020Difficulty 100 (Quantum Electrodynamics)
Outlines of Creation
Noyce, Elisha
631 Gutenberg downloadsen2015Difficulty 68 (Academic)
Cavity-Nesting Birds of North American Forests Agriculture Handbook 511
Scott, Virgil E. & Evans, Keith E. & Patton, David R. & Stone, Charles P.
630 Gutenberg downloadsen2015Difficulty 64 (Academic)
Recuerdos de mi vida (tomo 2 de 2)
Ramón y Cajal, Santiago
630 Gutenberg downloadses2019
Disease in plants
Ward, H. Marshall (Harry Marshall)
629 Gutenberg downloadsen2012Difficulty 66 (Academic)
Souvenirs entomologiques - Livre I Étude sur l'instinct et les moeurs des insectes
Fabre, Jean-Henri
629 Gutenberg downloadsfr2005
Studies of trees in winter : $b A description of the deciduous trees of northeastern America
Huntington, Annie Oakes
628 Gutenberg downloadsen2024Difficulty 51 (Graduate)
The Amphibians and Reptiles of Michoacán, México
Duellman, William Edward
628 Gutenberg downloadsen2010Difficulty 63 (Academic)
A handbook of systematic botany
Warming, Eugenius
627 Gutenberg downloadsen2022Difficulty 55 (Graduate)
The Origin of Vertebrates
Gaskell, Walter Holbrook
627 Gutenberg downloadsen2013Difficulty 82 (Specialist)
The Sacred Beetle, and Others
Fabre, Jean-Henri
627 Gutenberg downloadsen2021Difficulty 56 (Graduate)
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
626 Gutenberg downloadsen2014Difficulty 58 (Graduate)
The Meaning of Evolution
Schmucker, Samuel Christian
626 Gutenberg downloadsen2009Difficulty 51 (Graduate)
Wild Animals of North America Intimate Studies of Big and Little Creatures of the Mammal Kingdom
Nelson, Edward William
625 Gutenberg downloadsen2019Difficulty 52 (Graduate)
Animal Intelligence The International Scientific Series, Vol. XLIV.
Romanes, George John
624 Gutenberg downloadsen2012Difficulty 58 (Graduate)
Phrenology Examined
Flourens, P. (Pierre)
624 Gutenberg downloadsen2021Difficulty 59 (Graduate)
The winners in life's race : $b Or, the great backboned family
Buckley, Arabella B. (Arabella Burton)
624 Gutenberg downloadsen2024Difficulty 63 (Academic)
The Life of the Weevil
Fabre, Jean-Henri & Teixeira de Mattos, Alexander
623 Gutenberg downloadsen2021Difficulty 49 (College)
Appletons' Popular Science Monthly, March 1899 Volume LIV, No. 5, March 1899
Various
622 Gutenberg downloadsen2013Difficulty 57 (Graduate)
Die Naturwissenschaften in ihrer Entwicklung und in ihrem Zusammenhange, II. Band Von Galilei bis zur Mitte des XVIII. Jahrhunderts
Dannemann, Friedrich
622 Gutenberg downloadsde2017
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
622 Gutenberg downloadsen2012Difficulty 60 (Graduate)
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)
Collected Essays, Volume V Science and Christian Tradition: Essays
Huxley, Thomas Henry
620 Gutenberg downloadsen2005Difficulty 64 (Academic)
Animals of the Past
Lucas, Frederic A. (Frederic Augustus)
619 Gutenberg downloadsen2011Difficulty 60 (Graduate)
Life of Charles Darwin
Bettany, G. T. (George Thomas)
619 Gutenberg downloadsen2009Difficulty 63 (Academic)
Histology of the Blood, Normal and Pathological
Ehrlich, Paul & Lazarus, Adolf
618 Gutenberg downloadsen2009Difficulty 63 (Academic)
The Taleef Shereef; Or, Indian Materia Medica
Unknown
618 Gutenberg downloadsen2016Difficulty 54 (Graduate)
Haeckel : $b his life and work
Bölsche, Wilhelm
616 Gutenberg downloadsen2023Difficulty 53 (Graduate)
British Museum (Natural History) General Guide
British Museum (Natural History)
614 Gutenberg downloadsen2018Difficulty 69 (Academic)
The Chautauquan, Vol. 05, June 1885, No. 9
Chautauqua Literary and Scientific Circle & Chautauqua Institution
613 Gutenberg downloadsen2017Difficulty 53 (Graduate)
The Wild Elephant and the Method of Capturing and Taming it in Ceylon
Tennent, James Emerson, Sir
613 Gutenberg downloadsen2018Difficulty 65 (Academic)
Initiative in Evolution
Kidd, Walter
612 Gutenberg downloadsen2016Difficulty 57 (Graduate)
Scientific American Supplement, No. 598, June 18, 1887
Various
612 Gutenberg downloadsen2004Difficulty 50 (College)
Subspeciation in the Kangaroo Rat, Dipodomys ordii KU. Vol 1 No 23
Setzer, Henry W.
612 Gutenberg downloadsen2013Difficulty 66 (Academic)
Lehrbuch der Botanik für Hochschulen
Strasburger, Eduard & Noll, Fritz & Schenck, H. (Heinrich) & Schimper, A. F. W. (Andreas Franz Wilhelm)
611 Gutenberg downloadsde2020
Physics and Politics, or, Thoughts on the application of the principles of "natural selection" and "inheritance" to political society
Bagehot, Walter
611 Gutenberg downloadsen2003Difficulty 64 (Academic)
Student's Hand-book of Mushrooms of America, Edible and Poisonous
Taylor, Thomas
611 Gutenberg downloadsen2010Difficulty 60 (Graduate)
The Barren Ground Caribou of Keewatin
Harper, Francis
609 Gutenberg downloadsen2010Difficulty 59 (Graduate)
Disease and Its Causes
Councilman, W. T. (William Thomas)
608 Gutenberg downloadsen2005Difficulty 57 (Graduate)
Appletons' Popular Science Monthly, March 1900 Vol. 56, Nov. 1899 to April, 1900
Various
605 Gutenberg downloadsen2014Difficulty 55 (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)
605 Gutenberg downloadsen2012Difficulty 62 (Academic)
Nests and Eggs of Birds of the United States Illustrated
Gentry, Thomas G. (Thomas George)
605 Gutenberg downloadsen2014Difficulty 60 (Graduate)
Physiological Researches on Life and Death
Bichat, Xavier
605 Gutenberg downloadsen2018Difficulty 60 (Graduate)
The Chautauquan, Vol. 04, October 1883
Chautauqua Literary and Scientific Circle & Chautauqua Institution
605 Gutenberg downloadsen2016Difficulty 50 (College)
Natural Philosophy
Ostwald, Wilhelm
604 Gutenberg downloadsen2013Difficulty 60 (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
603 Gutenberg downloadsen2013Difficulty 57 (Graduate)
Homo-Culture; Or, The Improvement of Offspring Through Wiser Generation
Holbrook, M. L. (Martin Luther)
603 Gutenberg downloadsen2010Difficulty 66 (Academic)
Text book of veterinary medicine, Volume 1 (of 5)
Law, James
603 Gutenberg downloadsen2023Difficulty 67 (Academic)
Carpet Beetles and Their Control
Back, E. A. (Ernest Adna)
602 Gutenberg downloadsen2019Difficulty 55 (Graduate)
Darwiniana : Essays — Volume 02
Huxley, Thomas Henry
602 Gutenberg downloadsen2004Difficulty 68 (Academic)
The Wonders of Life: A Popular Study of Biological Philosophy
Haeckel, Ernst
602 Gutenberg downloadsen2014Difficulty 68 (Academic)
The Fundamentals of Bacteriology
Morrey, Charles Bradfield
601 Gutenberg downloadsen2013Difficulty 67 (Academic)
The Origin of Man and of His Superstitions
Read, Carveth
601 Gutenberg downloadsen2014Difficulty 59 (Graduate)
Luck, or Cunning, as the Main Means of Organic Modification
Butler, Samuel
600 Gutenberg downloadsen2004Difficulty 61 (Academic)
Scientific American, Volume XXXVI., No. 8, February 24, 1877 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures.
Various
600 Gutenberg downloadsen2006Difficulty 54 (Graduate)
The Birds of Australia, Vol. 1 of 7
Gould, John
600 Gutenberg downloadsen2021Difficulty 45 (College)
The Life and Love of the Insect
Fabre, Jean-Henri
600 Gutenberg downloadsen2022Difficulty 50 (College)
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
597 Gutenberg downloadsen2014Difficulty 56 (Graduate)
Les abeilles
Pérez, Jean M.
597 Gutenberg downloadsfr2011
Memoirs of the Distinguished Men of Science of Great Britain Living in the Years 1807-8
Walker, William
597 Gutenberg downloadsen2018Difficulty 61 (Academic)
Manual of the apiary
Cook, Albert John
596 Gutenberg downloadsen2022Difficulty 49 (College)
The Ocean World: Being a Description of the Sea and Its Living Inhabitants.
Figuier, Louis
596 Gutenberg downloadsen2014Difficulty 56 (Graduate)
A Hand-book to the Primates, Volume 2 (of 2)
Forbes, Henry O. (Henry Ogg)
595 Gutenberg downloadsen2013Difficulty 54 (Graduate)
The Anatomy of the Human Peritoneum and Abdominal Cavity Considered from the Standpoint of Development and Comparative Anatomy
Huntington, George S. (George Sumner)
595 Gutenberg downloadsen2013Difficulty 67 (Academic)
Darwiniana; Essays and Reviews Pertaining to Darwinism
Gray, Asa
594 Gutenberg downloadsen2004Difficulty 69 (Academic)
Directions for Collecting and Preserving Insects
Riley, Charles V. (Charles Valentine)
594 Gutenberg downloadsen2012Difficulty 70 (Academic)
Fruits of the Hawaiian Islands
Wilder, Gerrit Parmile
594 Gutenberg downloadsen2013Difficulty 52 (Graduate)
Half hours with the lower animals : $b protozoans, sponges, corals, shells, insects, and crustaceans
Holder, Charles Frederick
594 Gutenberg downloadsen2016Difficulty 51 (Graduate)
The Breath of Life
Burroughs, John
594 Gutenberg downloadsen2006Difficulty 57 (Graduate)
An introduction to the study of fishes
Günther, Albert C. L. G. (Albert Carl Ludwig Gotthilf)
593 Gutenberg downloadsen2023Difficulty 74 (Expert)
What is Darwinism?
Hodge, Charles
593 Gutenberg downloadsen2006Difficulty 53 (Graduate)
The Nursery-Book: A Complete Guide to the Multiplication and Pollination of Plants
Bailey, L. H. (Liberty Hyde)
592 Gutenberg downloadsen2015Difficulty 50 (College)
Journal of a tour in Marocco and the Great Atlas
Hooker, Joseph Dalton & Ball, John
591 Gutenberg downloadsen2023Difficulty 66 (Academic)
An Introduction to Entomology: Vol. 1 or Elements of the Natural History of the Insects
Kirby, William & Spence, William
590 Gutenberg downloadsen2013Difficulty 74 (Expert)
The Vivisectors' Directory Being a list of the licensed vivisectors in the United Kingdom, together with the leading physiologists in foreign laboratories
Unknown
590 Gutenberg downloadsen2017Difficulty 61 (Academic)
Stray Feathers From a Bird Man's Desk
Rand, Austin Loomer
589 Gutenberg downloadsen2021Difficulty 54 (Graduate)
The history of a mouthful of bread : $b and its effect on the organization of men and animals
Macé, Jean
589 Gutenberg downloadsen2004Difficulty 49 (College)
Regeneration
Morgan, Thomas Hunt
588 Gutenberg downloadsen2018Difficulty 57 (Graduate)
The Sea Shore
Furneaux, William S.
588 Gutenberg downloadsen2013Difficulty 49 (College)
Popular Books on Natural Science For Practical Use in Every Household, for Readers of All Classes
Bernstein, Aaron David
586 Gutenberg downloadsen2011Difficulty 50 (College)
The Chautauquan, Vol. 05, April 1885
Chautauqua Literary and Scientific Circle & Chautauqua Institution
586 Gutenberg downloadsen2017Difficulty 54 (Graduate)
Creierul, O Enigma Descifrata
Moisa, Dorin Teodor
585 Gutenberg downloadsro2004
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)
585 Gutenberg downloadsen2022Difficulty 49 (College)
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
584 Gutenberg downloadsen2022Difficulty 55 (Graduate)
Catalogue of Economic Plants in the Collection of the U. S. Department of Agriculture
Saunders, William
583 Gutenberg downloadsen2008Difficulty 52 (Graduate)
The romance of natural history, second series
Gosse, Philip Henry
583 Gutenberg downloadsen2010Difficulty 76 (Expert)
The Universal Kinship
Moore, J. Howard (John Howard)
583 Gutenberg downloadsen2020Difficulty 54 (Graduate)
The Story of Milk
Frederiksen, Johan Ditlev
582 Gutenberg downloadsen2021Difficulty 64 (Academic)
The works of Francis Maitland Balfour, Volume 1 (of 4) : $b Separate memoirs
Balfour, Francis M. (Francis Maitland)
582 Gutenberg downloadsen2012Difficulty 58 (Graduate)
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.
581 Gutenberg downloadsen2010Difficulty 55 (Graduate)
Physiology
Foster, M. (Michael), Sir
581 Gutenberg downloadsen2016Difficulty 39 (High School)
The Popular Science Monthly, October, 1900 Vol. 57, May, 1900 to October, 1900
Various
581 Gutenberg downloadsen2014Difficulty 75 (Expert)
Life: Its True Genesis
Flaccus, Horatius
580 Gutenberg downloadsen2005Difficulty 60 (Graduate)
Parallel Paths: A Study in Biology, Ethics, and Art
Rolleston, T. W. (Thomas William)
580 Gutenberg downloadsen2014Difficulty 69 (Academic)
Common Diseases of Farm Animals
Craig, Robert Alexander
579 Gutenberg downloadsen2005Difficulty 55 (Graduate)
Lectures on Evolution Essay #3 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
579 Gutenberg downloadsen2001Difficulty 69 (Academic)
The Industries of Animals
Houssay, Frédéric
579 Gutenberg downloadsen2009Difficulty 64 (Academic)
Lectures and Essays
Huxley, Thomas Henry
577 Gutenberg downloadsen2005Difficulty 58 (Graduate)
Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz
Legler, John M.
577 Gutenberg downloadsen2011Difficulty 63 (Academic)
The life of Pasteur
Vallery-Radot, René
577 Gutenberg downloadsen2019Difficulty 59 (Graduate)
The Origin of Species From 'The Westminster Review', April 1860
Huxley, Thomas Henry
577 Gutenberg downloadsen2001Difficulty 74 (Expert)
Aphorisms and Reflections from the works of T. H. Huxley
Huxley, Thomas Henry
576 Gutenberg downloadsen2011Difficulty 59 (Graduate)
Appletons' Popular Science Monthly, February 1900 Vol. 56, November, 1899 to April, 1900
Various
576 Gutenberg downloadsen2014Difficulty 62 (Academic)
Text Book of Biology, Part 1: Vertebrata
Wells, H. G. (Herbert George)
576 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
576 Gutenberg downloadsen2018Difficulty 64 (Academic)
Heroes of science : $b Botanists, zoologists, and geologists
Duncan, P. Martin (Peter Martin)
574 Gutenberg downloadsen2023Difficulty 58 (Graduate)
European Fungus Flora: Agaricaceae
Massee, George
573 Gutenberg downloadsen2010Difficulty 48 (College)
Intelligence in Plants and Animals Being a New Edition of the Author's Privately Issued "Soul and Immortality."
Gentry, Thomas G. (Thomas George)
573 Gutenberg downloadsen2021Difficulty 71 (Expert)
Physiology: The Science of the Body
Martin, Ernest G.
572 Gutenberg downloadsen2015Difficulty 53 (Graduate)
Scientific American Supplement, No. 711, August 17, 1889
Various
572 Gutenberg downloadsen2005Difficulty 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)
571 Gutenberg downloadsen2015Difficulty 78 (Expert)
The Natural Philosophy of Love
Gourmont, Remy de
571 Gutenberg downloadsen2014Difficulty 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
570 Gutenberg downloadsen2014Difficulty 68 (Academic)
The Evolutionist at Large
Allen, Grant
569 Gutenberg downloadsen2014Difficulty 55 (Graduate)
Versuche über Pflanzenhybriden
Mendel, Gregor
569 Gutenberg downloadsde2012
Journal of the Proceedings of the Linnean Society - Vol. 3 Zoology
Linnean Society of London
568 Gutenberg downloadsen2007Difficulty 62 (Academic)
Mammals of Mesa Verde National Park, Colorado
Anderson, Sydney
568 Gutenberg downloadsen2010Difficulty 53 (Graduate)
Time and Change
Burroughs, John
567 Gutenberg downloadsen2004Difficulty 54 (Graduate)
Water Reptiles of the Past and Present
Williston, Samuel Wendell
567 Gutenberg downloadsen2022Difficulty 63 (Academic)
On the Relations of Man to the Lower Animals
Huxley, Thomas Henry
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The zoology of the voyage of H.M.S. Beagle [vol. 3 of 5] : $b Birds
Gould, John
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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
565 Gutenberg downloadsen2018Difficulty 58 (Graduate)
Migration of Birds (1979)
Lincoln, Frederick Charles & Peterson, Steven R.
565 Gutenberg downloadsen2021Difficulty 68 (Academic)
Species Plantarum, Sections I-III
Linné, Carl von
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Stories of the Universe: Animal Life
Lindsay, B.
565 Gutenberg downloadsen2012Difficulty 51 (Graduate)
The Variation of Animals and Plants under Domestication — Volume 1
Darwin, Charles
565 Gutenberg downloadsen2001Difficulty 62 (Academic)
The Dinosaur Quarry. Dinosaur National Monument, Colorado-Utah
Good, John M. (John Maxwell) & Stucker, Gilbert F. & White, Theodore Elmer
564 Gutenberg downloadsen2015Difficulty 54 (Graduate)
British Pomology Or, the History, Description, Classification, and Synonymes, of the Fruits and Fruit Trees of Great Britain
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563 Gutenberg downloadsen2014Difficulty 58 (Graduate)
Dinosaurs, with Special Reference to the American Museum Collections
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563 Gutenberg downloadsen2006Difficulty 59 (Graduate)
Histology of medicinal plants
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563 Gutenberg downloadsen2021Difficulty 70 (Academic)
The Natural History of the Varieties of Man
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563 Gutenberg downloadsen2014Difficulty 64 (Academic)
A mechanical and critical enquiry into the nature of hermaphrodites
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562 Gutenberg downloadsen2023Difficulty 62 (Academic)
An Introduction to Entomology: Vol. 2 or Elements of the Natural History of the Insects
Kirby, William & Spence, William
562 Gutenberg downloadsen2013Difficulty 61 (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
562 Gutenberg downloadsen2021Difficulty 66 (Academic)
Metapsychical Phenomena: Methods and Observations
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The Genetic Effects of Radiation
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562 Gutenberg downloadsen2017Difficulty 59 (Graduate)
The Nests and Eggs of Indian Birds, Volume 1
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562 Gutenberg downloadsen2004Difficulty 49 (College)
Alfred Russel Wallace: Letters and Reminiscences, Vol. 2
Wallace, Alfred Russel & Marchant, James, Sir
561 Gutenberg downloadsen2005Difficulty 69 (Academic)
A Review of the Systems of Ethics Founded on the Theory of Evolution
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560 Gutenberg downloadsen2012Difficulty 100 (Quantum Electrodynamics)
A Hand-book to the Primates, Volume 1 (of 2)
Forbes, Henry O. (Henry Ogg)
559 Gutenberg downloadsen2013Difficulty 56 (Graduate)
Appletons' Popular Science Monthly, November 1898 Volume 54, November 1898
Various
559 Gutenberg downloadsen2013Difficulty 60 (Graduate)
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
559 Gutenberg downloadsen2018Difficulty 65 (Academic)
Text book of veterinary medicine, Volume 2 (of 5)
Law, James
559 Gutenberg downloadsen2023Difficulty 66 (Academic)
The Biology, Physiology and Sociology of Reproduction Also Sexual Hygiene with Special Reference to the Male
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559 Gutenberg downloadsen2008Difficulty 56 (Graduate)
Domesticated animals : $b Their relation to man and to his advancement in civilization
Shaler, Nathaniel Southgate
557 Gutenberg downloadsen2008Difficulty 63 (Academic)
The Lobster Fishery of Maine Bulletin of the United States Fish Commission, Vol. 19, Pages 241-265, 1899
Cobb, John N. (John Nathan)
557 Gutenberg downloadsen2006Difficulty 51 (Graduate)
Variation in the Muscles and Nerves of the Leg in Two Genera of Grouse (Tympanuchus and Pedioecetes)
Holmes, E. Bruce
557 Gutenberg downloadsen2013Difficulty 55 (Graduate)
Mr. Gladstone and Genesis Essay #5 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
556 Gutenberg downloadsen2001Difficulty 59 (Graduate)
Our Domestic Birds: Elementary Lessons in Aviculture
Robinson, John H. (John Henry)
556 Gutenberg downloadsen2010Difficulty 61 (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)
556 Gutenberg downloadsen2005Difficulty 53 (Graduate)
The alligator and its allies
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555 Gutenberg downloadsen2023Difficulty 53 (Graduate)
Studies in the Evolutionary Psychology of Feeling
Stanley, Hiram Miner
554 Gutenberg downloadsen2018Difficulty 62 (Academic)
Life Movements in Plants, Volume I
Bose, Jagadis Chandra
553 Gutenberg downloadsen2015Difficulty 69 (Academic)
The botanist's repository for new and rare plants; vol. 03 & 04 [of 10]
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553 Gutenberg downloadsen2024Difficulty 55 (Graduate)
A Monograph on the Sub-class Cirripedia (Volume 2 of 2) The Balanidæ, (or Sessile Cirripedes); the Verrucidæ, etc., etc.
Darwin, Charles
552 Gutenberg downloadsen2014Difficulty 57 (Graduate)
Beginners' zoology
Coleman, Walter Moore
552 Gutenberg downloadsen2024Difficulty 46 (College)
Essays Upon Some Controverted Questions
Huxley, Thomas Henry
552 Gutenberg downloadsen2010Difficulty 78 (Expert)
Facts and Arguments for Darwin
Müller, Fritz
552 Gutenberg downloadsen2004Difficulty 70 (Academic)
The Making of Species
Dewar, Douglas & Finn, Frank
552 Gutenberg downloadsen2013Difficulty 72 (Expert)
The Academic Gregories
Stewart, Agnes Grainger
551 Gutenberg downloadsen2016Difficulty 59 (Graduate)
The Honey-Bee: Its Natural History, Physiology and Management
Bevan, Edward
551 Gutenberg downloadsen2022Difficulty 63 (Academic)
Freshwater Sponges, Hydroids & Polyzoa
Annandale, Nelson
550 Gutenberg downloadsen2011Difficulty 61 (Academic)
Pearls & Parasites
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The Structure and Habits of Spiders
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550 Gutenberg downloadsen2018Difficulty 44 (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
549 Gutenberg downloadsen2014Difficulty 61 (Academic)
The book of antelopes, vol. 3 (of 4)
Sclater, Philip Lutley & Thomas, Oldfield
548 Gutenberg downloadsen2023Difficulty 45 (College)
Was Man Created?
Mott, Henry A. (Henry Augustus)
548 Gutenberg downloadsen2009Difficulty 66 (Academic)
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.
546 Gutenberg downloadsen2010Difficulty 56 (Graduate)
The Principal Species of Wood: Their Characteristic Properties First Edition
Snow, Charles H. (Charles Henry)
546 Gutenberg downloadsen2014Difficulty 60 (Graduate)
Appletons' Popular Science Monthly, February 1899 Volume LIV, No. 4, February 1899
Various
545 Gutenberg downloadsen2013Difficulty 57 (Graduate)
Poisonous Dwellers of the Desert
Dodge, Natt N. (Natt Noyes)
544 Gutenberg downloadsen2017Difficulty 61 (Academic)
A Revision of Snakes of the Genus Conophis (Family Colubridae, from Middle America)
Wellman, John
543 Gutenberg downloadsen2011Difficulty 59 (Graduate)
The Botanical Magazine, Vol. 01 Or, Flower-Garden Displayed
Curtis, William
543 Gutenberg downloadsen2005Difficulty 57 (Graduate)
The Structure and Life-history of the Cockroach (Periplaneta orientalis) An Introduction to the Study of Insects
Miall, L. C. (Louis Compton) & Denny, Alfred
543 Gutenberg downloadsen2016Difficulty 58 (Graduate)
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
542 Gutenberg downloadsen2014Difficulty 60 (Graduate)
Charles Darwin and the Theory of Natural Selection
Poulton, Edward Bagnall, Sir
542 Gutenberg downloadsen2021Difficulty 60 (Graduate)
On the Method of Zadig Essay #1 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
542 Gutenberg downloadsen2001Difficulty 66 (Academic)
Scientific American magazine Vol 2. No. 3 Oct 10 1846 The Advocate of Industry and Journal of Scientific, Mechanical and Other Improvements
Various
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Lameness of the Horse Veterinary Practitioners' Series, No. 1
Lacroix, John Victor
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On the Genesis of Species
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The birds of Jamaica
Gosse, Philip Henry
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Thoughts on Religion
Romanes, George John
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Darwinism stated by Darwin himself Characteristic passages from the writings of Charles Darwin
Darwin, Charles
540 Gutenberg downloadsen2022Difficulty 64 (Academic)
Scientific American Supplement, No. 561, October 2, 1886
Various
540 Gutenberg downloadsen2005Difficulty 50 (College)
The Dolphin in History
Montagu, Ashley & Lilly, John Cunningham
540 Gutenberg downloadsen2019Difficulty 56 (Graduate)
The honey bee: a manual of instruction in apiculture
Benton, Frank
540 Gutenberg downloadsen2022Difficulty 55 (Graduate)
Criticisms on "The Origin of Species" From 'The Natural History Review', 1864
Huxley, Thomas Henry
539 Gutenberg downloadsen2001Difficulty 64 (Academic)
Travels on the Amazon
Wallace, Alfred Russel
539 Gutenberg downloadsen2016Difficulty 65 (Academic)
Les énigmes de l'Univers
Haeckel, Ernst
538 Gutenberg downloadsfr2012
Botany for Ladies or, A Popular Introduction to the Natural System of Plants, According to the Classification of De Candolle.
Loudon, Mrs. (Jane)
537 Gutenberg downloadsen2014Difficulty 54 (Graduate)
Self-Organizing Systems, 1963
Unknown
537 Gutenberg downloadsen2021Difficulty 72 (Expert)
The Flea
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537 Gutenberg downloadsen2014Difficulty 53 (Graduate)
Trees of Indiana First Revised Edition (Publication No. 13, Department of Conservation, State of Indiana)
Deam, Charles Clemon
537 Gutenberg downloadsen2012Difficulty 50 (College)
On Some Fossil Remains of Man
Huxley, Thomas Henry
536 Gutenberg downloadsen2001Difficulty 60 (Graduate)
The Last Link: Our Present Knowledge of the Descent of Man
Haeckel, Ernst
536 Gutenberg downloadsen2013Difficulty 63 (Academic)
Dragons of the Air: An Account of Extinct Flying Reptiles
Seeley, H. G. (Harry Govier)
535 Gutenberg downloadsen2011Difficulty 54 (Graduate)
Elementary Botany
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535 Gutenberg downloadsen2021Difficulty 53 (Graduate)
The Hunting Wasps
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535 Gutenberg downloadsen2022Difficulty 57 (Graduate)
Scientific American Supplement, No. 299, September 24, 1881
Various
533 Gutenberg downloadsen2005Difficulty 60 (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)
533 Gutenberg downloadsen2016Difficulty 58 (Graduate)
British birds
Hudson, W. H. (William Henry) & Beddard, Frank E. (Frank Evers)
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North American Recent Soft-Shelled Turtles (Family Trionychidae)
Webb, Robert G. (Robert Gravem)
532 Gutenberg downloadsen2012Difficulty 71 (Expert)
The Crayfish: An Introduction to the Study of Zoology.
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532 Gutenberg downloadsen2019Difficulty 54 (Graduate)
Appletons' Popular Science Monthly, April 1899 Volume LIV, No. 6, April 1899
Various
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The Biological Problem of To-day: Preformation Or Epigenesis? The Basis of a Theory of Organic Development
Hertwig, Oscar
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Through Magic Glasses and Other Lectures A Sequel to The Fairyland of Science
Buckley, Arabella B. (Arabella Burton)
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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
529 Gutenberg downloadsen2014Difficulty 60 (Graduate)
The Fantastic Clan: The Cactus Family
Thornber, J. J. (John James) & Bonker, Frances
528 Gutenberg downloadsen2014Difficulty 67 (Academic)
Flowers of the Southwest Deserts
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527 Gutenberg downloadsen2016Difficulty 61 (Academic)
Scientific American Supplement, No. 795, March 28, 1891
Various
527 Gutenberg downloadsen2004Difficulty 62 (Academic)
The Illustrated Self-Instructor in Phrenology and Physiology
Fowler, O. S. (Orson Squire) & Fowler, L. N. (Lorenzo Niles)
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Biology and Its Makers With Portraits and Other Illustrations
Locy, William A. (William Albert)
526 Gutenberg downloadsen2019Difficulty 56 (Graduate)
Guide to the study of animal ecology
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526 Gutenberg downloadsen2023Difficulty 66 (Academic)
The Science and Philosophy of the Organism
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526 Gutenberg downloadsen2013Difficulty 67 (Academic)
A Synopsis of the Birds of North America
Audubon, John James
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Trees: A Woodland Notebook Containing Observations on Certain British and Exotic Trees
Maxwell, Herbert, Sir
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Our Common Insects A Popular Account of the Insects of Our Fields, Forests, Gardens and Houses
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The Diatomaceæ of Philadelphia and Vicinity
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524 Gutenberg downloadsen2014Difficulty 67 (Academic)
Apes and Monkeys: Their Life and Language
Garner, R. L. (Richard Lynch)
523 Gutenberg downloadsen2022Difficulty 55 (Graduate)
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
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The Naturalist's Repository, Volume 1 (of 5) or Monthly Miscellany of Exotic Natural History: etc. etc.
Donovan, E. (Edward)
523 Gutenberg downloadsen2017Difficulty 76 (Expert)
Studies in the Theory of Descent, Volume I
Weismann, August
522 Gutenberg downloadsen2015Difficulty 68 (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
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The romance of the animal world : $b Interesting descriptions of the strange & curious in natural history
Selous, Edmund
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Scientific American Supplement, No. 643, April 28, 1888
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Studies on Fermentation The diseases of beer, their causes, and the means of preventing them
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Life of Elie Metchnikoff, 1845-1916
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Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, Second Part: Subclass Osculosa; Index Report on the Scientific Results of the Voyage of H.M.S. Challenger During the Years 1873-76, Vol. XVIII
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The Pros and Cons of Vivisection
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An Australian Bird Book: A Pocket Book for Field Use
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Appletons' Popular Science Monthly, January 1899 Volume LIV, No. 3, January 1899
Various
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Common objects of the microscope
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519 Gutenberg downloadsen2017Difficulty 69 (Academic)
Creation and Its Records A Brief Statement of Christian Belief with Reference to Modern Facts and Ancient Scripture
Baden-Powell, B. H. (Baden Henry)
519 Gutenberg downloadsen2004Difficulty 62 (Academic)
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.
519 Gutenberg downloadsen2022Difficulty 63 (Academic)
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The English moths and butterflies : $b Together with the plants, flowers, and fruits whereon they feed, and are usually found.
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Grundriß der menschlichen Erblichkeitslehre und Rassenhygiene (1/2) Menschliche Erblichkeitslehre
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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
518 Gutenberg downloadsen2004Difficulty 55 (Graduate)
Travels into North America, Volume 2 (of 3)
Kalm, Pehr
518 Gutenberg downloadsen2023Difficulty 47 (College)
Scientific American Supplement, No. 799, April 25, 1891
Various
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Some Common Birds Useful to the Farmer (1915 edition)
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516 Gutenberg downloadsen2020Difficulty 54 (Graduate)
The History of Insects
Unknown
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The Migration of Birds
Coward, T. A. (Thomas Alfred)
516 Gutenberg downloadsen2013Difficulty 67 (Academic)
The Naturalist in Nicaragua
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The Tropical World Aspects of man and nature in the equatorial regions of the globe.
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Daedalus : $b or, Science and the future
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The Arena, Volume 18, No. 93, August, 1897
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The Fishing Industry
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514 Gutenberg downloadsen2016Difficulty 54 (Graduate)
Zoological Illustrations, Volume 1 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
514 Gutenberg downloadsen2012Difficulty 64 (Academic)
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513 Gutenberg downloadsen2017Difficulty 66 (Academic)
On the Advisableness of Improving Natural Knowledge
Huxley, Thomas Henry
513 Gutenberg downloadsen2001Difficulty 72 (Expert)
Scientific American Supplement, No. 286, June 25, 1881
Various
513 Gutenberg downloadsen2005Difficulty 53 (Graduate)
The Evolution of Man — Volume 1
Haeckel, Ernst
513 Gutenberg downloadsen2004Difficulty 52 (Graduate)
The book of antelopes, vol. 2 (of 4)
Sclater, Philip Lutley & Thomas, Oldfield
512 Gutenberg downloadsen2023Difficulty 48 (College)
Wasps, Social and Solitary
Peckham, George W. (George Williams) & Peckham, E. G. (Elizabeth Gifford)
512 Gutenberg downloadsen2014Difficulty 60 (Graduate)
A Historical Account of Useful Inventions and Scientific Discoveries Being a manual of instruction and entertainment.
Grant, George
511 Gutenberg downloadsen2016Difficulty 62 (Academic)
Coral and Coral Reefs
Huxley, Thomas Henry
511 Gutenberg downloadsen2001Difficulty 58 (Graduate)
The British Woodlice Being a Monograph of the Terrestrial Isopod Crustacea Occurring in the British Islands
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Dactylography; Or, The Study of Finger-prints
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Speciation and Evolution of the Pygmy Mice, Genus Baiomys
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A Statistical Inquiry Into the Nature and Treatment of Epilepsy
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Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901
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On the cattle plague: or, Contagious typhus in horned cattle. Its history, origin, description, and treatment
Bourguignon, Honoré
508 Gutenberg downloadsen2011Difficulty 69 (Academic)
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
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Useful Knowledge: Volume 2. Vegetables Or, a familiar account of the various productions of nature
Bingley, William
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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
506 Gutenberg downloadsen2022Difficulty 59 (Graduate)
The Book of Love
Mantegazza, Paolo
506 Gutenberg downloadsen2018Difficulty 72 (Expert)
The Rise and Progress of Palaeontology Essay #2 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
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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
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Introduction à l'étude de la médecine expérimentale
Bernard, Claude
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The Social Direction of Evolution: An Outline of the Science of Eugenics
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Die Cellularpathologie in ihrer Begründung auf physiologische und pathologische Gewebelehre
Virchow, Rudolf
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Inheritance of Characteristics in Domestic Fowl
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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"
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The ethics of Hercules : $b A study of man's body as the sole determinant of ethical values
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Fossil Butterflies Memoirs of the American Association for the Advancement of Science, I.
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An Introduction to Entomology: Vol. 4 or Elements of the Natural History of the Insects
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502 Gutenberg downloadsen2013Difficulty 68 (Academic)
Geological Contemporaneity and Persistent Types of Life
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Anthropoid apes
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Forest Trees of Illinois: How to Know Them
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Natural History of the Racer Coluber constrictor
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Scientific American Supplement, No. 324, March 18, 1882
Various
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Scientific American Supplement, No. 385, May 19, 1883
Various
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From an Easy Chair
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Wood and Forest
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Scientific American Supplement, No. 315, January 14, 1882
Various
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The Bird Study Book
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The Coal Measures Amphibia of North America
Moodie, Roy Lee
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Birds in Flight
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Louis Pasteur: His Life and Labours
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The Life of an Insect being a history of the changes of insects from the egg to the perfect being.
Unknown
498 Gutenberg downloadsen2014Difficulty 62 (Academic)
First course in biology
Bailey, L. H. (Liberty Hyde) & Coleman, Walter Moore
497 Gutenberg downloadsen2025Difficulty 46 (College)
Food Poisoning
Jordan, Edwin O. (Edwin Oakes)
497 Gutenberg downloadsen2010Difficulty 65 (Academic)
A Preliminary Revision of the North American Species of Cactus, Anhalonium, and Lophophora
Coulter, John Merle
496 Gutenberg downloadsen1998Difficulty 56 (Graduate)
Scientific American Supplement, No. 433, April 19, 1884
Various
496 Gutenberg downloadsen2005Difficulty 66 (Academic)
Charles Darwin
Allen, Grant
495 Gutenberg downloadsen2010Difficulty 73 (Expert)
Studies in the Theory of Descent, Volume II
Weismann, August
495 Gutenberg downloadsen2015Difficulty 65 (Academic)
The works of Francis Maitland Balfour, Volume 2 (of 4) : $b A treatise on comparative embryology: Invertebrata
Balfour, Francis M. (Francis Maitland)
495 Gutenberg downloadsen2014Difficulty 64 (Academic)
The Popular Science Monthly, June, 1900 Vol. 57, May, 1900 to October, 1900
Various
494 Gutenberg downloadsen2014Difficulty 69 (Academic)
Aphorisms and Reflections from the Works of T. H. Huxley
Huxley, Thomas Henry
493 Gutenberg downloadsen2011Difficulty 60 (Graduate)
Hints towards the formation of a more comprehensive theory of life.
Coleridge, Samuel Taylor
493 Gutenberg downloadsen2008Difficulty 68 (Academic)
Island Life; Or, The Phenomena and Causes of Insular Faunas and Floras
Wallace, Alfred Russel
493 Gutenberg downloadsen2010Difficulty 89 (Specialist)
On the Reception of the 'Origin of Species'
Huxley, Thomas Henry
493 Gutenberg downloadsen2000Difficulty 66 (Academic)
On the Seashore Cassell's "Eyes and No Eyes" Series, Book VII
Smith, R. Cadwallader
493 Gutenberg downloadsen2003Difficulty 35 (High School)
The Fairy-Land of Science
Buckley, Arabella B. (Arabella Burton)
493 Gutenberg downloadsen2004Difficulty 48 (College)
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
492 Gutenberg downloadsen2025Difficulty 65 (Academic)
Evolution: Its nature, its evidence, and its relation to religious thought
LeConte, Joseph
492 Gutenberg downloadsen2014Difficulty 88 (Specialist)
Mendel's principles of heredity: A defence
Bateson, William & Mendel, Gregor
492 Gutenberg downloadsen2022Difficulty 55 (Graduate)
Plague Its Cause and the Manner of its Extension, Its Menace, Its Control and Suppression, Its Diagnosis and Treatment
Jackson, Thomas Wright
492 Gutenberg downloadsen2013Difficulty 68 (Academic)
Studies on Epidemic Influenza: Comprising Clinical and Laboratory Investigations
University of Pittsburgh. School of Medicine
492 Gutenberg downloadsen2019Difficulty 62 (Academic)
The Avifauna of Micronesia, Its Origin, Evolution, and Distribution
Baker, Rollin H. (Rollin Harold)
492 Gutenberg downloadsen2013Difficulty 61 (Academic)
The Migration of North American Birds (1935)
Lincoln, Frederick Charles
492 Gutenberg downloadsen2021Difficulty 71 (Expert)
The Minor Horrors of War
Shipley, A. E. (Arthur Everett), Sir
492 Gutenberg downloadsen2021Difficulty 51 (Graduate)
Natural Wonders
Brewster, Edwin Tenney
491 Gutenberg downloadsen2015Difficulty 40 (High School)
Scientific American Supplement, No. 829, November 21, 1891
Various
491 Gutenberg downloadsen2005Difficulty 63 (Academic)
The Botanical Magazine, Vol. 05 Or, Flower-Garden Displayed
Curtis, William
491 Gutenberg downloadsen2006Difficulty 57 (Graduate)
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
491 Gutenberg downloadsen2001Difficulty 65 (Academic)
Essays in eugenics
Galton, Francis
490 Gutenberg downloadsen2024Difficulty 59 (Graduate)
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
490 Gutenberg downloadsen2007Difficulty 52 (Graduate)
Garden Pests in New Zealand A Popular Manual for Practical Gardeners, Farmers and Schools
Miller, David
489 Gutenberg downloadsen2014Difficulty 71 (Expert)
God and the World: A Survey of Thought
Robinson, Arthur William
489 Gutenberg downloadsen2009Difficulty 60 (Graduate)
The Botanical Magazine, Vol. 03 Or, Flower-Garden Displayed
Curtis, William
489 Gutenberg downloadsen2006Difficulty 57 (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
489 Gutenberg downloadsen2001Difficulty 61 (Academic)
Atoms, Nature, and Man: Man-made Radioactivity in the Environment
Hines, Neal O.
488 Gutenberg downloadsen2015Difficulty 68 (Academic)
Barium: A Cause of the Loco-Weed Disease
Crawford, Albert C. (Albert Cornelius)
488 Gutenberg downloadsen2012Difficulty 57 (Graduate)
Little Masterpieces of Science: Health and Healing
Unknown
488 Gutenberg downloadsen2014Difficulty 53 (Graduate)
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
488 Gutenberg downloadsen2021Difficulty 53 (Graduate)
A Manual of Philippine Birds
McGregor, Richard C. (Richard Crittenden)
487 Gutenberg downloadsen2014Difficulty 68 (Academic)
Neotropical Hylid Frogs, Genus Smilisca
Duellman, William Edward & Trueb, Linda
487 Gutenberg downloadsen2011Difficulty 60 (Graduate)
On Snake-Poison: Its Action and Its Antidote
Mueller, A.
487 Gutenberg downloadsen2010Difficulty 69 (Academic)
Practical Skunk Raising A Book of Information Concerning the Raising of Skunks for Profit
Pratt, William Edwin
487 Gutenberg downloadsen2014Difficulty 40 (High School)
Sea-Weeds, Shells and Fossils
Gray, Peter & Woodward, B. B. (Bernard Bolingbroke)
487 Gutenberg downloadsen2011Difficulty 58 (Graduate)
Animal Castration
Liautard, Alexandre François Augustin
486 Gutenberg downloadsen2019Difficulty 71 (Expert)
Buchanan's Journal of Man, August 1887 Volume 1, Number 7
Unknown
486 Gutenberg downloadsen2008Difficulty 63 (Academic)
La simulación en la lucha por la vida
Ingenieros, José
486 Gutenberg downloadses2020
Scientific American Supplement, No. 492, June 6, 1885
Various
486 Gutenberg downloadsen2004Difficulty 53 (Graduate)
The honey-bee: its nature, homes and products
Harris, William Hetherington
486 Gutenberg downloadsen2022Difficulty 56 (Graduate)
Illustrations of the Birds of California, Texas, Oregon, British and Russian America
Cassin, John
485 Gutenberg downloadsen2021Difficulty 63 (Academic)
Scientific American Supplement, No. 303, October 22, 1881
Various
485 Gutenberg downloadsen2005Difficulty 52 (Graduate)
The flowering plants of South Africa; vol. 3
Pole Evans, I. B. (Illtyd Buller)
485 Gutenberg downloadsen2021Difficulty 52 (Graduate)
The octopus : $b or, The "devil-fish" of fiction and of fact
Lee, Henry
485 Gutenberg downloadsen2023Difficulty 61 (Academic)
A first book in organic evolution
Shute, D. Kerfoot (Daniel Kerfoot)
484 Gutenberg downloadsen2024Difficulty 58 (Graduate)
Evolution and creation
Hardwicke, Herbert Junius
484 Gutenberg downloadsen2017Difficulty 64 (Academic)
Grasses : $b A handbook for use in the field and laboratory
Ward, H. Marshall (Harry Marshall)
484 Gutenberg downloadsen2015Difficulty 56 (Graduate)
Yeast
Huxley, Thomas Henry
484 Gutenberg downloadsen2001Difficulty 66 (Academic)
De afstamming van den mensch en de seksueele teeltkeus, deel 1 (van 2)
Darwin, Charles
483 Gutenberg downloadsnl2022
Influenza : $b An epidemiologic study
Vaughan, Warren T. (Warren Taylor)
483 Gutenberg downloadsen2023Difficulty 66 (Academic)
Irritability : $b a physiological analysis of the general effect of stimuli in living substance
Verworn, Max
482 Gutenberg downloadsen2021Difficulty 65 (Academic)
Scientific American Supplement, No. 601, July 9, 1887
Various
482 Gutenberg downloadsen2004Difficulty 53 (Graduate)
The Birds of Australia, Vol. 5 of 7
Gould, John
482 Gutenberg downloadsen2020Difficulty 61 (Academic)
The Speech of Monkeys
Garner, R. L. (Richard Lynch)
481 Gutenberg downloadsen2010Difficulty 54 (Graduate)
The Popular Science Monthly, July, 1900 Vol. 57, May, 1900 to October, 1900
Various
480 Gutenberg downloadsen2014Difficulty 56 (Graduate)
The botanist's repository for new and rare plants; vol. 08 [of 10]
Andrews, Henry Cranke, active 1799-1828
479 Gutenberg downloadsen2024Difficulty 58 (Graduate)
The human foot and the human hand
Humphry, George Murray, Sir
479 Gutenberg downloadsen2025Difficulty 48 (College)
Desert and water gardens of the Red Sea : $b Being an account of the natives and the shore formations of the coast
Crossland, Cyril
478 Gutenberg downloadsen2023Difficulty 50 (College)
The Destiny of Man, Viewed in the Light of His Origin
Fiske, John
478 Gutenberg downloadsen2005Difficulty 65 (Academic)
Scientific American Supplement No. 822, October 3, 1891
Various
477 Gutenberg downloadsen2005Difficulty 55 (Graduate)
The Toxicity of Caffein: An experimental study on different species of animals
Salant, William & Rieger, J. B. (John Benjamin)
477 Gutenberg downloadsen2014Difficulty 63 (Academic)
Les grands froids
Bouant, Emile
476 Gutenberg downloadsfr2013
Scientific American Supplement, No. 417, December 29, 1883
Various
476 Gutenberg downloadsen2005Difficulty 65 (Academic)
The Orchid Album, Volume 3 Comprising Coloured Figures and Descriptions of New, Rare, and Beautiful Orchidaceous Plants
Moore, Thomas
476 Gutenberg downloadsen2019Difficulty 57 (Graduate)
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
475 Gutenberg downloadsen2001Difficulty 67 (Academic)
Botanical features of the Algerian Sahara
Cannon, William Austin
475 Gutenberg downloadsen2023Difficulty 52 (Graduate)
Life History of the Kangaroo Rat
Vorhies, Charles Taylor & Taylor, Walter P. (Walter Penn)
475 Gutenberg downloadsen2006Difficulty 62 (Academic)
The Atom and the Ocean
Hull, E. W. Seabrook
475 Gutenberg downloadsen2021Difficulty 61 (Academic)
The Courtship of Animals
Pycraft, W. P. (William Plane)
475 Gutenberg downloadsen2019Difficulty 66 (Academic)
Amphibians and Reptiles of the Rainforests of Southern El Petén, Guatemala
Duellman, William Edward
474 Gutenberg downloadsen2011Difficulty 64 (Academic)
Animal Parasites and Messmates
Beneden, P. J. van (Pierre Joseph)
474 Gutenberg downloadsen2015Difficulty 57 (Graduate)
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
474 Gutenberg downloadsen2014Difficulty 65 (Academic)
De Canibus Britannicis: Of Englishe Dogges
Caius, John
474 Gutenberg downloadsen2008Difficulty 81 (Specialist)
Science and Morals and Other Essays
Windle, Bertram Coghill Alan, Sir
474 Gutenberg downloadsen2008Difficulty 56 (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
474 Gutenberg downloadsen2001Difficulty 64 (Academic)
The Botanical Magazine, Vol. 02 Or, Flower-Garden Displayed
Curtis, William
473 Gutenberg downloadsen2006Difficulty 57 (Graduate)
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
473 Gutenberg downloadsen2025Difficulty 49 (College)
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)
472 Gutenberg downloadsen2024Difficulty 59 (Graduate)
Roses: or, a Monograph of the Genus Rosa
Andrews, Henry Cranke, active 1799-1828
472 Gutenberg downloadsen2021Difficulty 63 (Academic)
The Interpreters of Genesis and the Interpreters of Nature Essay #4 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
472 Gutenberg downloadsen2001Difficulty 65 (Academic)
The Pecan and its Culture
Hume, H. Harold (Hardrada Harold)
472 Gutenberg downloadsen2009Difficulty 57 (Graduate)
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
472 Gutenberg downloadsen2001Difficulty 66 (Academic)
The zoology of the voyage of H.M.S. Beagle [vol. 2 of 5] : $b Mammalia
Waterhouse, G. R. (George Robert)
472 Gutenberg downloadsen2022Difficulty 53 (Graduate)
Theory of circulation by respiration : $b synopsis of its principles and history
Willard, Emma
472 Gutenberg downloadsen2006Difficulty 57 (Graduate)
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
471 Gutenberg downloadsen2014Difficulty 61 (Academic)
Himalayan Journals — Volume 1 Or, Notes of a Naturalist in Bengal, the Sikkim and Nepal Himalayas, the Khasia Mountains, etc.
Hooker, Joseph Dalton
471 Gutenberg downloadsen2004Difficulty 74 (Expert)
Ideen zu einer Physiognomik der Gewächse
Humboldt, Alexander von
471 Gutenberg downloadsde2007
Scientific American Supplement, No. 358, November 11, 1882
Various
471 Gutenberg downloadsen2005Difficulty 61 (Academic)
The Birds of Australia, Vol. 3 of 7
Gould, John
471 Gutenberg downloadsen2019Difficulty 61 (Academic)
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)
470 Gutenberg downloadsen2021Difficulty 63 (Academic)
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
470 Gutenberg downloadsen2018Difficulty 64 (Academic)
The Life and Letters of George John Romanes, M.A., LL.D., F.R.S.
Romanes, George John & Romanes, Ethel Duncan
470 Gutenberg downloadsen2015Difficulty 52 (Graduate)
The Story of Creation as Told By Theology and By Science
Ackland, T. S. (Thomas Suter)
470 Gutenberg downloadsen2003Difficulty 62 (Academic)
Evolution and Classification of the Pocket Gophers of the Subfamily Geomyinae
Russell, Robert J.
469 Gutenberg downloadsen2012Difficulty 65 (Academic)
Living lights : $b A popular account of phosphorescent animals and vegetables
Holder, Charles Frederick
469 Gutenberg downloadsen2025Difficulty 58 (Graduate)
Quadrupeds, What They Are and Where Found: A Book of Zoology for Boys
Reid, Mayne
468 Gutenberg downloadsen2007Difficulty 55 (Graduate)
Scientific American Supplement, No. 275, April 9, 1881
Various
468 Gutenberg downloadsen2005Difficulty 57 (Graduate)
Territory in Bird Life
Howard, Henry Eliot
468 Gutenberg downloadsen2010Difficulty 62 (Academic)
The botanist's repository for new and rare plants; vol. 09 [of 10]
Andrews, Henry Cranke, active 1799-1828
468 Gutenberg downloadsen2024Difficulty 55 (Graduate)
Chambers's Elementary Science Readers Book I
Various
467 Gutenberg downloadsen2006Difficulty 27 (Middle School)
How to Know the Ferns
Bastin, S. Leonard
467 Gutenberg downloadsen2014Difficulty 50 (College)
On the Variation of Species, with Especial Reference to the Insecta Followed by an Inquiry into the Nature of Genera
Wollaston, Thomas Vernon
467 Gutenberg downloadsen2012Difficulty 78 (Expert)
An Account of the Insects Noxious to Agriculture and Plants in New Zealand The Scale Insects (Coccididae)
Maskell, William Miles
466 Gutenberg downloadsen2015Difficulty 53 (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
466 Gutenberg downloadsen2000Difficulty 66 (Academic)
The Lights of the Church and the Light of Science Essay #6 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
466 Gutenberg downloadsen2001Difficulty 70 (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
466 Gutenberg downloadsen2021Difficulty 52 (Graduate)
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
466 Gutenberg downloadsen2011Difficulty 48 (College)
The Mental Life of Monkeys and Apes: A Study of Ideational Behavior
Yerkes, Robert Mearns
464 Gutenberg downloadsen2004Difficulty 61 (Academic)
Agricultural zoology
Ritzema Bos, J. (Jan)
463 Gutenberg downloadsen2025Difficulty 52 (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
463 Gutenberg downloadsen2005Difficulty 64 (Academic)
Q. E. D., or New Light on the Doctrine of Creation
Price, George McCready
463 Gutenberg downloadsen2004Difficulty 67 (Academic)
The Rocky Mountain Goat
Grant, Madison
463 Gutenberg downloadsen2015Difficulty 57 (Graduate)
Scientific American Supplement, No. 455, September 20, 1884
Various
462 Gutenberg downloadsen2004Difficulty 57 (Graduate)
Migration of Birds (1950)
Lincoln, Frederick Charles
461 Gutenberg downloadsen2021Difficulty 70 (Academic)
Science in Arcady
Allen, Grant
461 Gutenberg downloadsen2005Difficulty 63 (Academic)
The Evolution of Man Scientifically Disproved in 50 Arguments
Williams, William A. (William Asbury)
461 Gutenberg downloadsen2005Difficulty 55 (Graduate)
Scientific American Supplement, No. 363, December 16, 1882
Various
460 Gutenberg downloadsen2005Difficulty 62 (Academic)
Seed Dispersal
Beal, W. J. (William James)
460 Gutenberg downloadsen2008Difficulty 46 (College)
Travels into North America, Volume 3 (of 3)
Kalm, Pehr
459 Gutenberg downloadsen2024Difficulty 50 (College)
On Germinal Selection as a Source of Definite Variation
Weismann, August
458 Gutenberg downloadsen2010Difficulty 69 (Academic)
The Insect
Michelet, Jules
458 Gutenberg downloadsen2013Difficulty 61 (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
457 Gutenberg downloadsde2024
L'Académie des sciences et les académiciens de 1666 à 1793
Bertrand, Joseph
457 Gutenberg downloadsfr2016
Marvels of Pond-life Or, A Year's Microscopic Recreations Among the Polyps, Infusoria, Rotifers, Water-bears and Polyzoa
Slack, Henry James
457 Gutenberg downloadsen2011Difficulty 74 (Expert)
New observations on the natural history of bees
Huber, François
457 Gutenberg downloadsen2008Difficulty 57 (Graduate)
On the phenomena of variation and geographical distribution as illustrated by the Papilionidæ of the Malayan region
Wallace, Alfred Russel
457 Gutenberg downloadsen2024Difficulty 66 (Academic)
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
457 Gutenberg downloadsen2019Difficulty 64 (Academic)
The flowering plants of South Africa; vol. 4
Pole Evans, I. B. (Illtyd Buller)
457 Gutenberg downloadsen2023Difficulty 49 (College)
A history of evolution
Fenton, Carroll Lane
456 Gutenberg downloadsen2025Difficulty 63 (Academic)
Darwin, and After Darwin, Volume 3 of 3 Post-Darwinian Questions: Isolation and Physiological Selection
Romanes, George John
456 Gutenberg downloadsen2011Difficulty 66 (Academic)
Insects and Diseases of Trees in the South
Anonymous
456 Gutenberg downloadsen2015Difficulty 55 (Graduate)
Introduction to the Study of Palæontological Botany
Balfour, John Hutton
456 Gutenberg downloadsen2016Difficulty 55 (Graduate)
Descriptive Zoopraxography; or, the science of animal locomotion made popular
Muybridge, Eadweard
455 Gutenberg downloadsen2012Difficulty 72 (Expert)
Grundzüge der Paläontologie (Paläozoologie). 1. Abteilung: Invertebrata.
Zittel, Karl Alfred von
455 Gutenberg downloadsde2023
Myology and Serology of the Avian Family Fringillidae: A Taxonomic Study
Stallcup, William B.
455 Gutenberg downloadsen2010Difficulty 65 (Academic)
The flowering plants of South Africa; vol. 5
Pole Evans, I. B. (Illtyd Buller)
455 Gutenberg downloadsen2025Difficulty 50 (College)
Cassell's book of birds; vol. 2
Brehm, Alfred Edmund
454 Gutenberg downloadsen2018Difficulty 58 (Graduate)
Catalogue of the dipterous insects collected at Singapore and Malacca
Wallace, Alfred Russel
454 Gutenberg downloadsen2023Difficulty 56 (Graduate)
Experiments on Animals
Paget, Stephen
454 Gutenberg downloadsen2013Difficulty 59 (Graduate)
Some Common Birds in Their Relation to Agriculture
Beal, F. E. L. (Foster Ellenborough Lascelles)
453 Gutenberg downloadsen2020Difficulty 55 (Graduate)
Within the Deep Cassell's "Eyes and No Eyes" Series, Book VIII.
Smith, R. Cadwallader
453 Gutenberg downloadsen2004Difficulty 34 (High School)
A Synopsis of the North American Lagomorpha
Hall, E. Raymond (Eugene Raymond)
452 Gutenberg downloadsen2010Difficulty 53 (Graduate)
Atlas de poche des mammifères de la France, de la Suisse romane et de la Belgique avec leur description, moeurs et organisation
Martin, René
452 Gutenberg downloadsfr2017
Ecological Studies of the Timber Wolf in Northeastern Minnesota
Mech, L. David & Frenzel, Louis Daniel & Karns, P. D. & Ream, Robert R. & Winship, John W.
452 Gutenberg downloadsen2011Difficulty 52 (Graduate)
Evolution of Life and Form Four lectures delivered at the twenty-third anniversary meeting of the Theosophical Society at Adyar, Madras, 1898
Besant, Annie
452 Gutenberg downloadsen2012Difficulty 60 (Graduate)
Het Leven der Dieren, Deel 3, Hoofdstuk 04: De Insecten
Brehm, Alfred Edmund
452 Gutenberg downloadsnl2020
Scientific American Supplement, No. 520, December 19, 1885
Various
452 Gutenberg downloadsen2004Difficulty 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
451 Gutenberg downloadsen2014Difficulty 54 (Graduate)
Duality of Voice
Sutro, Emil
451 Gutenberg downloadsen2015Difficulty 63 (Academic)
Rudiments of Conchology Intended as a familiar introduction to the science.
Venning, Mary Anne
451 Gutenberg downloadsen2015Difficulty 49 (College)
The chocolate-plant (Theobroma cacao) and its products
Anonymous
451 Gutenberg downloadsen2025Difficulty 55 (Graduate)
The Factors of Organic Evolution
Spencer, Herbert
451 Gutenberg downloadsen2016Difficulty 70 (Academic)
The Sense of Taste
Hollingworth, Harry L. (Harry Levi) & Poffenberger, Albert T. (Albert Theodore)
451 Gutenberg downloadsen2019Difficulty 69 (Academic)
American Addresses, with a Lecture on the Study of Biology
Huxley, Thomas Henry
450 Gutenberg downloadsen2005Difficulty 67 (Academic)
Measles
Rucker, William Colby
450 Gutenberg downloadsen2006Difficulty 50 (College)
Scientific American Supplement, No. 595, May 28, 1887
Various
450 Gutenberg downloadsen2004Difficulty 52 (Graduate)
Select Specimens of Natural History Collected in Travels to Discover the Source of the Nile. Volume 5.
Bruce, James
450 Gutenberg downloadsen2018Difficulty 64 (Academic)
The zoology of the voyage of H.M.S. Beagle [vol. 1 of 5] : $b Fossil mammalia
Owen, Richard
450 Gutenberg downloadsen2022Difficulty 58 (Graduate)
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.
449 Gutenberg downloadsen2010Difficulty 56 (Graduate)
Grundzüge der Paläontologie (Paläozoologie). 2. Abteilung: Vertebrata.
Zittel, Karl Alfred von
449 Gutenberg downloadsde2025
Notes and Letters on the Natural History of Norfolk More Especially on the Birds and Fishes
Browne, Thomas, Sir
449 Gutenberg downloadsen2011Difficulty 62 (Academic)
Our Summer Migrants An Account of the Migratory Birds Which Pass the Summer in the British Islands.
Harting, James Edmund
449 Gutenberg downloadsen2019Difficulty 57 (Graduate)
Some Reptiles and Amphibians from Korea
Webb, Robert G. (Robert Gravem) & Byers, George William & Jones, J. Knox
449 Gutenberg downloadsen2011Difficulty 57 (Graduate)
A Guide for the Study of Animals
Whitney, Worrallo & Lucas, Frederic Colby & Shinn, Harold Brough & Smallwood, Mabel Elizabeth
448 Gutenberg downloadsen2011Difficulty 48 (College)
Mendelism Third Edition
Punnett, Reginald Crundall
448 Gutenberg downloadsen2009Difficulty 61 (Academic)
Bee Keeping
Benton, Frank
447 Gutenberg downloadsen2015Difficulty 63 (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)
447 Gutenberg downloadsen2010Difficulty 67 (Academic)
Inorganic Plant Poisons and Stimulants
Brenchley, Winifred Elsie
447 Gutenberg downloadsen2015Difficulty 61 (Academic)
The Story of Germ Life
Conn, H. W. (Herbert William)
447 Gutenberg downloadsen2004Difficulty 60 (Graduate)
Zeugnisse für die Stellung des Menschen in der Natur
Huxley, Thomas Henry
447 Gutenberg downloadsde2010
Darwin, and After Darwin, Volume 2 of 3 Post-Darwinian Questions: Heredity and Utility
Romanes, George John
446 Gutenberg downloadsen2011Difficulty 64 (Academic)
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
445 Gutenberg downloadsen2023Difficulty 45 (College)
Ecological Observations on the Woodrat, Neotoma floridana
Fitch, Henry S. (Henry Sheldon) & Rainey, Dennis G.
445 Gutenberg downloadsen2010Difficulty 59 (Graduate)
Insect manufactures
Anonymous
445 Gutenberg downloadsen2024Difficulty 60 (Graduate)
The Birds of Australia, Vol. 4 of 7
Gould, John
445 Gutenberg downloadsen2019Difficulty 64 (Academic)
The Evolution of Man — Volume 2
Haeckel, Ernst
445 Gutenberg downloadsen2004Difficulty 55 (Graduate)
The Philosophy of Health; Volume 1 (of 2) or, an exposition of the physical and mental constitution of man
Smith, Southwood
445 Gutenberg downloadsen2019Difficulty 73 (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
444 Gutenberg downloadsen2014Difficulty 66 (Academic)
Supplement to Harvesting Ants and Trap-Door Spiders
Moggridge, John Traherne & Pickard-Cambridge, Octavius
444 Gutenberg downloadsen2021Difficulty 59 (Graduate)
A Mechanical Account of Poisons in Several Essays
Mead, Richard
443 Gutenberg downloadsen2016Difficulty 73 (Expert)
Colour vision : $b Being the Tyndall Lectures delivered in 1894 at the Royal Institution
Abney, William de Wiveleslie, Sir
443 Gutenberg downloadsen2024Difficulty 55 (Graduate)
International Weekly Miscellany of Literature, Art and Science — Volume 1, No. 2, July 8, 1850
Various
443 Gutenberg downloadsen2004Difficulty 59 (Graduate)
Physiological economy in nutrition, with special reference to the minimal proteid requirement of the healthy man an experimental study
Chittenden, R. H. (Russell Henry)
443 Gutenberg downloadsen2022Difficulty 66 (Academic)
A Bilateral Division of the Parietal Bone in a Chimpanzee; with a Special Reference to the Oblique Sutures in the Parietal
Hrdlička, Aleš
442 Gutenberg downloadsen2010Difficulty 65 (Academic)
The cretaceous birds of New Jersey
Olson, Storrs L. & Parris, David C.
442 Gutenberg downloadsen2022Difficulty 69 (Academic)
The Essentials of Illustration A Practical Guide to the Reproduction of Drawings & Photographs for the Use of Scientists & Others
Hill, Thomas George
442 Gutenberg downloadsen2011Difficulty 58 (Graduate)
Careers in Atomic Energy
McIlhenny, Loyce J.
441 Gutenberg downloadsen2013Difficulty 68 (Academic)
Nouveaux souvenirs entomologiques - Livre II Étude sur l'instinct et les moeurs des insectes
Fabre, Jean-Henri
441 Gutenberg downloadsfr2006
On the Study of Zoology
Huxley, Thomas Henry
441 Gutenberg downloadsen2001Difficulty 66 (Academic)
Scientific American Supplement, No. 810, July 11, 1891
Various
441 Gutenberg downloadsen2005Difficulty 51 (Graduate)
The Birds of Australia, Vol. 2 of 7
Gould, John
441 Gutenberg downloadsen2019Difficulty 66 (Academic)
Chambers's Journal of Popular Literature, Science, and Art, No. 683 January 27, 1877
Various
440 Gutenberg downloadsen2014Difficulty 50 (College)
Cholera and the Water Supply in the South Districts of London in 1854
Snow, John
440 Gutenberg downloadsen2021Difficulty 71 (Expert)
Rust, Smut, Mildew, & Mould: An Introduction to the Study of Microscopic Fungi
Cooke, M. C. (Mordecai Cubitt)
440 Gutenberg downloadsen2020Difficulty 61 (Academic)
Species Plantarum, Sections VI-X
Linné, Carl von
440 Gutenberg downloadsla2009
Discourses: Biological & Geological Essays
Huxley, Thomas Henry
439 Gutenberg downloadsen2003Difficulty 61 (Academic)
Experiments and Observations Relative to the Influence Lately Discovered by M. Galvani and Commonly Called Animal Electricity
Fowler, Richard
439 Gutenberg downloadsen2014Difficulty 64 (Academic)
Food Habits of the Thrushes of the United States
Beal, F. E. L. (Foster Ellenborough Lascelles)
439 Gutenberg downloadsen2010Difficulty 54 (Graduate)
Les Phénomènes Psychiques Occultes: État Actuel de la Question
Coste, Albert
439 Gutenberg downloadsfr2013
The Dancing Mouse: A Study in Animal Behavior
Yerkes, Robert Mearns
439 Gutenberg downloadsen2005Difficulty 64 (Academic)
The History of Esculent Fish
North, Roger
439 Gutenberg downloadsen2021Difficulty 47 (College)
Zoological Illustrations, Second Series, Volume 3 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
439 Gutenberg downloadsen2013Difficulty 61 (Academic)
A Handbook of Some South Indian Grasses
Rangachari, K. & Tadulinga Mudaliyar, C.
438 Gutenberg downloadsen2007Difficulty 50 (College)
Birds, Illustrated by Color Photography, Vol. 1, No. 6 June, 1897
Various
438 Gutenberg downloadsen2009Difficulty 48 (College)
The Dwelling House
Poore, George Vivian
438 Gutenberg downloadsen2015Difficulty 52 (Graduate)
The Gospel of Evolution From "The Atheistic Platform", Twelve Lectures
Aveling, Edward B.
438 Gutenberg downloadsen2011Difficulty 55 (Graduate)
An Examination of Weismannism
Romanes, George John
437 Gutenberg downloadsen2015Difficulty 74 (Expert)
An Experimental Translocation of the Eastern Timber Wolf
Weise, Thomas F. & Hook, Richard A. & Mech, L. David & Robinson, William Laughlin
437 Gutenberg downloadsen2011Difficulty 56 (Graduate)
Identifying Hardwoods Growing on Pine Sites
Brown, Clair A. (Clair Alan) & Grelen, Harold E.
437 Gutenberg downloadsen2021Difficulty 54 (Graduate)
On the phenomena of hybridity in the genus Homo
Broca, Paul
437 Gutenberg downloadsen2014Difficulty 66 (Academic)
Scientific American Supplement, No. 787, January 31, 1891
Various
437 Gutenberg downloadsen2004Difficulty 53 (Graduate)
The Body at Work: A Treatise on the Principles of Physiology
Hill, Alex
437 Gutenberg downloadsen2020Difficulty 54 (Graduate)
On the origin of inflammation of the veins and of the causes, consequences, and treatment of purulent deposits
Lee, Henry, M.D.
436 Gutenberg downloadsen2014Difficulty 65 (Academic)
Poultry diseases Causes, symptoms and treatment, with notes on post-mortem examinations
Wortley, E. J. (E. Jocelyn)
436 Gutenberg downloadsen2022Difficulty 57 (Graduate)
The Elements of Agriculture A Book for Young Farmers, with Questions Prepared for the Use of Schools
Waring, George E. (George Edwin)
436 Gutenberg downloadsen2010Difficulty 53 (Graduate)
The House Fly and How to Suppress It
Howard, L. O. (Leland Ossian) & Bishopp, F. C. (Fred Corry)
436 Gutenberg downloadsen2006Difficulty 54 (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)
436 Gutenberg downloadsen2007Difficulty 57 (Graduate)
The Study of Plant Life
Stopes, Marie Carmichael
436 Gutenberg downloadsen2019Difficulty 43 (College)
Bacteria in Daily Life
Frankland, Grace C.
435 Gutenberg downloadsen2013Difficulty 81 (Specialist)
Food of the Crow, Corvus brachyrhynchos Brehm, in South-central Kansas
Platt, Dwight R.
435 Gutenberg downloadsen2010Difficulty 53 (Graduate)
Sanitation in Panama
Gorgas, William Crawford
435 Gutenberg downloadsen2023Difficulty 56 (Graduate)
The Adductor Muscles of the Jaw In Some Primitive Reptiles
Fox, Richard C.
435 Gutenberg downloadsen2009Difficulty 66 (Academic)
The giant sequoia : $b An account of the history and characteristics of the big trees of California
Ellsworth, Rodney Sydes
435 Gutenberg downloadsen2025Difficulty 56 (Graduate)
Appletons' Popular Science Monthly, May, 1900 Vol. 57, May, 1900 to October, 1900
Various
434 Gutenberg downloadsen2014Difficulty 60 (Graduate)
Bees
Phillips, Everett Franklin
434 Gutenberg downloadsen2015Difficulty 52 (Graduate)
Die Naturwissenschaften in ihrer Entwicklung und in ihrem Zusammenhange, IV. Band Das Emporblühen der modernen Naturwissenschaften seit der Entdeckung des Energieprinzips
Dannemann, Friedrich
434 Gutenberg downloadsde2019
Some Common Birds Useful to the Farmer (1926 edition)
Beal, F. E. L. (Foster Ellenborough Lascelles)
434 Gutenberg downloadsen2020Difficulty 55 (Graduate)
Venomous arthropod handbook : $b envenomization symptoms/treatment, identification, biology and control
Biery, Terry L.
434 Gutenberg downloadsen2018Difficulty 66 (Academic)
Comparative Breeding Behavior of Ammospiza caudacuta and A. maritima
Woolfenden, Glen Everett
433 Gutenberg downloadsen2011Difficulty 54 (Graduate)
The Darwinian Hypothesis
Huxley, Thomas Henry
433 Gutenberg downloadsen2001Difficulty 69 (Academic)
The Hand Phrenologically Considered Being a Glimpse at the Relation of the Mind with the Organisation of the Body
Anonymous
433 Gutenberg downloadsen2016Difficulty 70 (Academic)
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
432 Gutenberg downloadsde2008
La vie des termites
Maeterlinck, Maurice
432 Gutenberg downloadsfr2024
Mazedonien : $b Erlebnisse und Beobachtungen eines Naturforschers im Gefolge des deutschen Heeres
Doflein, Franz
432 Gutenberg downloadsde2023
Scientific American Supplement, No. 344, August 5, 1882
Various
432 Gutenberg downloadsen2005Difficulty 54 (Graduate)
Fathers of Biology
McRae, Charles
431 Gutenberg downloadsen2008Difficulty 64 (Academic)
Illustrations of Exotic Entomology, Volume 3
Drury, Dru
431 Gutenberg downloadsen2014Difficulty 57 (Graduate)
Lamarck et son OEuvre
Corra, Emile
431 Gutenberg downloadsfr2012
The works of Francis Maitland Balfour, Volume 4 (of 4) : $b Plates
Balfour, Francis M. (Francis Maitland)
431 Gutenberg downloadsen2014Difficulty 50 (College)
Aromatics and the Soul: A Study of Smells
McKenzie, Dan
430 Gutenberg downloadsen2019Difficulty 53 (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
430 Gutenberg downloadsen2015Difficulty 69 (Academic)
Little Busybodies: The Life of Crickets, Ants, Bees, Beetles, and Other Busybodies
Marks, Jeannette Augustus & Moody, Julia
430 Gutenberg downloadsen2007Difficulty 34 (High School)
Ants and Some Other Insects: An Inquiry Into the Psychic Powers of These Animals
Forel, Auguste
429 Gutenberg downloadsen2016Difficulty 70 (Academic)
De l'origine des espèces
Darwin, Charles
429 Gutenberg downloadsfr2004
The preparation & mounting of microscopic objects
Davies, Thomas
429 Gutenberg downloadsen2019Difficulty 53 (Graduate)
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
428 Gutenberg downloadsen2021Difficulty 43 (College)
Seaside Studies in Natural History. Marine Animals of Massachusetts Bay. Radiates.
Agassiz, Elizabeth Cabot Cary & Agassiz, Alexander
428 Gutenberg downloadsen2011Difficulty 52 (Graduate)
Flowers and their friends
Morley, Margaret Warner
427 Gutenberg downloadsen2024Difficulty 39 (High School)
Journal of Entomology and Zoology, Vol. 09, No. 1, March 1917
Various
427 Gutenberg downloadsen2015Difficulty 53 (Graduate)
Life among the butterflies
Randolph, Vance
427 Gutenberg downloadsen2022Difficulty 56 (Graduate)
Scientific American Supplement, No. 648, June 2, 1888.
Various
427 Gutenberg downloadsen2011Difficulty 54 (Graduate)
The little book of British quadrupeds
May, W.
427 Gutenberg downloadsen2024Difficulty 44 (College)
The Postnatal Development of Two Broods of Great Horned Owls (Bubo virginianus)
Hoffmeister, Donald Frederick & Setzer, Henry W.
427 Gutenberg downloadsen2011Difficulty 51 (Graduate)
An ethical problem; or, Sidelights upon scientific experimentation on man and animals
Leffingwell, Albert
426 Gutenberg downloadsen2006Difficulty 64 (Academic)
The Deseado Formation of Patagonia
Loomis, Frederic Brewster
426 Gutenberg downloadsen2024Difficulty 61 (Academic)
Biology : $b A lecture delivered at Columbia University in the series on Science, Philosophy and Art November 20, 1907
Wilson, Edmund B. (Edmund Beecher)
425 Gutenberg downloadsen2006Difficulty 69 (Academic)
The Bedbug [1916]
Marlatt, C. L.
425 Gutenberg downloadsen2020Difficulty 61 (Academic)
The Botanical Magazine, Vol. 08 Or, Flower-Garden Displayed
Curtis, William
425 Gutenberg downloadsen2008Difficulty 60 (Graduate)
Section Cutting and Staining A practical introduction to histological methods for students and practitioners
Colman, Walter S.
424 Gutenberg downloadsen2016Difficulty 50 (College)
The botanist's repository for new and rare plants; vol. 07 [of 10]
Andrews, Henry Cranke, active 1799-1828
424 Gutenberg downloadsen2024Difficulty 57 (Graduate)
The Ohio naturalist, Vol. 1, No. 3, January, 1901
Ohio State University. Biological Club
424 Gutenberg downloadsen2023Difficulty 53 (Graduate)
The Ohio Naturalist, Vol. II, No. 1, November, 1901
Ohio State University. Biological Club
424 Gutenberg downloadsen2023Difficulty 53 (Graduate)
Mushroom and Toadstools How to Distinguish Easily the Differences Between Edible and Poisonous Fungi
Smith, Worthington George
423 Gutenberg downloadsen2019Difficulty 49 (College)
Scientific American Supplement, No. 388, June 9, 1883
Various
423 Gutenberg downloadsen2005Difficulty 56 (Graduate)
The Brain and the Voice in Speech and Song
Mott, F. W. (Frederick Walker)
423 Gutenberg downloadsen2004Difficulty 68 (Academic)
Bog-trotting for orchids
Niles, Grace Greylock
422 Gutenberg downloadsen2025Difficulty 61 (Academic)
Darwinism and Race Progress
Haycraft, John Berry
422 Gutenberg downloadsen2014Difficulty 71 (Expert)
Het Leven der Dieren. Deel 3. Afdeling 2. De Visschen
Brehm, Alfred Edmund
422 Gutenberg downloadsnl2016
The Scientific Evidences of Organic Evolution
Romanes, George John
422 Gutenberg downloadsen2006Difficulty 67 (Academic)
British Butterflies: Figures and Descriptions of Every Native Species
Coleman, W. S. (William Stephen)
421 Gutenberg downloadsen2010Difficulty 65 (Academic)
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
421 Gutenberg downloadsde2024
Mammals of Northwestern South Dakota
Andersen, Kenneth W. & Jones, J. Knox
420 Gutenberg downloadsen2010Difficulty 50 (College)
Mimicry in Butterflies
Punnett, Reginald Crundall
420 Gutenberg downloadsen2013Difficulty 62 (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
420 Gutenberg downloadsen2021Difficulty 44 (College)
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)
420 Gutenberg downloadsen2014Difficulty 54 (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.)
420 Gutenberg downloadsen2023Difficulty 51 (Graduate)
Outlines of dairy bacteriology, 10th edition A concise manual for the use of students in dairying
Russell, H. L. (Harry Luman) & Hastings, E. G. (Edwin George)
418 Gutenberg downloadsen2010Difficulty 60 (Graduate)
Cranial Osteology of the Hylid Frog, Smilisca baudini
Trueb, Linda
417 Gutenberg downloadsen2010Difficulty 61 (Academic)
Embryology: The Beginnings of Life
Leighton, Gerald R. (Gerald Rowley)
417 Gutenberg downloadsen2011Difficulty 59 (Graduate)
Nouvel atlas de poche des champignons Comestibles et Vénéneux les plus répandus. Série II (Première édition)
Dumée, Paul
417 Gutenberg downloadsfr2017
The Ancestry of Modern Amphibia: A Review of the Evidence
Eaton, Theodore H. (Theodore Hildreth)
417 Gutenberg downloadsen2011Difficulty 69 (Academic)
Die epiphytische Vegetation Amerikas
Schimper, A. F. W. (Andreas Franz Wilhelm)
416 Gutenberg downloadsde2007
Journal of Entomology and Zoology, Vol. 11, No. 1, March 1919
Various
416 Gutenberg downloadsen2014Difficulty 62 (Academic)
The Kingdom of Man
Lankester, E. Ray (Edwin Ray), Sir
416 Gutenberg downloadsen2019Difficulty 61 (Academic)
Zoological Illustrations, Second Series, Volume 2 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
416 Gutenberg downloadsen2013Difficulty 60 (Graduate)
Gorillas & Chimpanzees
Garner, R. L. (Richard Lynch)
415 Gutenberg downloadsen2013Difficulty 51 (Graduate)
Little Masterpieces of Science: The Naturalist as Interpreter and Seer
Unknown
415 Gutenberg downloadsen2009Difficulty 63 (Academic)
Epidemics Examined and Explained: or, Living Germs Proved by Analogy to be a Source of Disease
Grove, John
414 Gutenberg downloadsen2010Difficulty 65 (Academic)
Supplement to the catalogue of seals and whales in the British Museum
Gray, John Edward
414 Gutenberg downloadsen2023Difficulty 45 (College)
The Recent Mammals of Tamaulipas, México
Alvarez, Ticul
414 Gutenberg downloadsen2012Difficulty 56 (Graduate)
Emanuel Swedenborg's Investigations in Natural Science and the Basis for His Statements Concerning the Functions of the Brain
Ramström, Martin
413 Gutenberg downloadsen2020Difficulty 71 (Expert)
The Underworld of Oregon Caves National Monument
Contor, Roger J.
413 Gutenberg downloadsen2019Difficulty 56 (Graduate)
Über die Entstehung der Arten im Thier- und Pflanzen-Reich durch natürliche Züchtung
Darwin, Charles
413 Gutenberg downloadsde2022
A Synopsis of the American Bats of the Genus Pipistrellus
Hall, E. Raymond (Eugene Raymond) & Dalquest, Walter Woelber
412 Gutenberg downloadsen2010Difficulty 58 (Graduate)
Biology versus Theology. The Bible: irreconcilable with Science, Experience, and even its own statements
Julian
412 Gutenberg downloadsen2021Difficulty 52 (Graduate)
Die Welträtsel: Gemeinverständliche Studien über Monistische Philosophie
Haeckel, Ernst
412 Gutenberg downloadsde2019
Greek Biology & Greek Medicine
Singer, Charles
412 Gutenberg downloadsen2020Difficulty 56 (Graduate)
Ilex cassine, the aboriginal North American tea $b Its history, distribution, and use among the native North American Indians
Hale, Edwin M. (Edwin Moses)
412 Gutenberg downloadsen2023Difficulty 52 (Graduate)
Jelly-Fish, Star-Fish, and Sea-Urchins: Being a Research on Primitive Nervous Systems
Romanes, George John
412 Gutenberg downloadsen2014Difficulty 64 (Academic)
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
412 Gutenberg downloadsen2015Difficulty 58 (Graduate)
The botanist's repository for new and rare plants; vol. 05 [of 10]
Andrews, Henry Cranke, active 1799-1828
412 Gutenberg downloadsen2024Difficulty 55 (Graduate)
A Mechanico-Physiological Theory of Organic Evolution
Nägeli, Carl
411 Gutenberg downloadsen2010Difficulty 74 (Expert)
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
411 Gutenberg downloadsen2013Difficulty 48 (College)
British Sea Birds
Dixon, Charles
411 Gutenberg downloadsen2014Difficulty 61 (Academic)
Hormones and Heredity A Discussion of the Evolution of Adaptations and the Evolution of Species
Cunningham, J. T. (Joseph Thomas)
411 Gutenberg downloadsen2005Difficulty 73 (Expert)
Lehrbuch der Toxikologie für Tierärzte
Fröhner, Eugen
411 Gutenberg downloadsde2022
Respiration Calorimeters for Studying the Respiratory Exchange and Energy Transformations of Man
Benedict, Francis Gano & Carpenter, Thorne M. (Thorne Martin)
411 Gutenberg downloadsen2009Difficulty 65 (Academic)
Scientific American Supplement, No. 441, June 14, 1884.
Various
411 Gutenberg downloadsen2005Difficulty 56 (Graduate)
Birds' Nests, Eggs and Egg-Collecting
Kearton, Richard
410 Gutenberg downloadsen2014Difficulty 65 (Academic)
Dans la Haute-Gambie : $b Voyage d'exploration scientifique, 1891-1892
Rançon, A. (André)
410 Gutenberg downloadsfr2024
Development of the Digestive Canal of the American Alligator
Reese, A. M. (Albert Moore)
410 Gutenberg downloadsen2007Difficulty 58 (Graduate)
Texas Honey Plants
Sanborn, Charles Emerson & Scholl, Ernest E. (Ernest Emmett)
410 Gutenberg downloadsen2012Difficulty 53 (Graduate)
The House We Live In; or, The Making of the Body
Farnsworth, Vesta J.
410 Gutenberg downloadsen2021Difficulty 31 (High School)
Mammals of the San Gabriel Mountains of California
Vaughan, Terry A.
409 Gutenberg downloadsen2011Difficulty 63 (Academic)
The Philosophy of Health; Volume 2 (of 2) or, an exposition of the physical and mental constitution of man
Smith, Southwood
408 Gutenberg downloadsen2019Difficulty 72 (Expert)
The run
Hay, John
408 Gutenberg downloadsen2025Difficulty 48 (College)
A Theory of Creation: A Review of 'Vestiges of the Natural History of Creation'
Bowen, Francis
407 Gutenberg downloadsen2008Difficulty 67 (Academic)
Der Unterkiefer des Homo Heidelbergensis: Aus den Sanden von Mauer bei Heidelberg
Schoetensack, Otto
407 Gutenberg downloadsde2011
Grundriß der menschlichen Erblichkeitslehre und Rassenhygiene (2/2) Menschliche Auslese und Rassenhygiene
Lenz, Fritz
407 Gutenberg downloadsde2015
A bacteriological study of ham souring
McBryde, Charles Neil
406 Gutenberg downloadsen2022Difficulty 59 (Graduate)
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)
406 Gutenberg downloadsen2020Difficulty 67 (Academic)
On the Origin and Metamorphoses of Insects
Lubbock, John, Sir
406 Gutenberg downloadsen2011Difficulty 54 (Graduate)
Systematic Status of the Colubrid Snake, Leptodeira discolor Günther
Duellman, William Edward
406 Gutenberg downloadsen2011Difficulty 63 (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
406 Gutenberg downloadsen2015Difficulty 68 (Academic)
Keys to Fungi on Dung
Richardson, M. J. (Michael J.) & Watling, Roy
405 Gutenberg downloadsen2018Difficulty 57 (Graduate)
Scientific Essays and Lectures
Kingsley, Charles
405 Gutenberg downloadsen2003Difficulty 56 (Graduate)
ABC's of Science
Oliver, Charles A. (Charles Alexander)
404 Gutenberg downloadsen1998Difficulty 51 (Graduate)
Flytraps and Their Operation [1921]
Bishopp, F. C. (Fred Corry)
404 Gutenberg downloadsen2020Difficulty 48 (College)
House Rats and Mice
Lantz, David E. (David Ernest)
404 Gutenberg downloadsen2011Difficulty 51 (Graduate)
Phylogeny of the Waxwings and Allied Birds
Arvey, M. Dale (Martin Dale)
404 Gutenberg downloadsen2010Difficulty 66 (Academic)
A synopsis of the palms of Puerto Rico
Cook, O. F. (Orator Fuller)
403 Gutenberg downloadsen2023Difficulty 63 (Academic)
An inaugural dissertation on pulmonary consumption
Delafield, Edward
403 Gutenberg downloadsen2022Difficulty 63 (Academic)
The Botanical Magazine, Vol. 10 Or, Flower-Garden Displayed
Curtis, William
403 Gutenberg downloadsen2020Difficulty 57 (Graduate)
The philosophy of biology
Johnstone, James
403 Gutenberg downloadsen2020Difficulty 65 (Academic)
The Subspecific Status of Two Central American Sloths
Hall, E. Raymond (Eugene Raymond) & Kelson, Keith R.
403 Gutenberg downloadsen2010Difficulty 62 (Academic)
A New Order of Fishlike Amphibia From the Pennsylvanian of Kansas
Eaton, Theodore H. (Theodore Hildreth) & Stewart, Peggy Lou
402 Gutenberg downloadsen2010Difficulty 55 (Graduate)
A Review of the Frogs of the Hyla bistincta Group
Duellman, William Edward
402 Gutenberg downloadsen2010Difficulty 60 (Graduate)
Palæontological Report of the Princeton Scientific Expedition of 1877
Osborn, Henry Fairfield & Scott, William Berryman & Speir, Francis
402 Gutenberg downloadsen2021Difficulty 56 (Graduate)
The Breeding Birds of Kansas
Johnston, Richard F.
402 Gutenberg downloadsen2011Difficulty 74 (Expert)
The Popular Science Monthly, August, 1900 Vol. 57, May, 1900 to October, 1900
Various
402 Gutenberg downloadsen2014Difficulty 68 (Academic)
A New Hylid Frog from Eastern Mexico. University of Kansas Publication, Vol 1, No 15
Taylor, Edward Harrison
401 Gutenberg downloadsen2010Difficulty 62 (Academic)
Den Hunting as a Means of Coyote Control
Young, Stanley Paul & Dobyns, Harold Warren
401 Gutenberg downloadsen2015Difficulty 49 (College)
Pecan Diseases and Pests and Their Control
Rosburg, David W. & King, D. R.
401 Gutenberg downloadsen2021Difficulty 64 (Academic)
The Kansas University Science Bulletin (Vol. I, No. 1)
Various
401 Gutenberg downloadsen2017Difficulty 50 (College)
Evolution and Adaptation
Morgan, Thomas Hunt
400 Gutenberg downloadsen2020Difficulty 62 (Academic)
Geographic Variation in the North American Cyprinid Fish, Hybopsis gracilis
Olund, Leonard J. & Cross, Frank B. (Frank Bernard)
400 Gutenberg downloadsen2011Difficulty 57 (Graduate)
The Botanical Magazine, Vol. 13 Or, Flower-Garden Displayed
Curtis, William & Sims, John
400 Gutenberg downloadsen2013Difficulty 58 (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
399 Gutenberg downloadsen2004Difficulty 64 (Academic)
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
Fothergill, John
399 Gutenberg downloadsen2017Difficulty 67 (Academic)
Essays in Natural History and Agriculture
Garnett, Thomas
399 Gutenberg downloadsen2006Difficulty 64 (Academic)
Evolution Social and Organic
Lewis, Arthur M. (Arthur Morrow)
399 Gutenberg downloadsen2018Difficulty 57 (Graduate)
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)
399 Gutenberg downloadsen2019Difficulty 61 (Academic)
Memoir on the Dodo (Didus ineptus, Linn.)
Owen, Richard
399 Gutenberg downloadsen2025Difficulty 57 (Graduate)
The plurality of the human race
Pouchet, G. (Georges)
399 Gutenberg downloadsen2023Difficulty 61 (Academic)
Earthworms and Their Allies
Beddard, Frank E. (Frank Evers)
398 Gutenberg downloadsen2013Difficulty 59 (Graduate)
Journal of Entomology and Zoology, Vol. 06, No. 4, December 1914
Various
398 Gutenberg downloadsen2015Difficulty 53 (Graduate)
Journal of Entomology and Zoology, Vol. 11, No. 4, December 1919
Various
398 Gutenberg downloadsen2011Difficulty 54 (Graduate)
New England Salmon Hatcheries and Salmon Fisheries in the Late 19th Century
Various
398 Gutenberg downloadsen2005Difficulty 53 (Graduate)
Race Improvement; or, Eugenics: A Little Book on a Great Subject
Baker, La Reine Helen McKenzie
398 Gutenberg downloadsen2015Difficulty 63 (Academic)
The Fern Bulletin, October 1903 A Quarterly Devoted to Ferns
Various
398 Gutenberg downloadsen2018Difficulty 50 (College)
An Elementary Text-book of the Microscope including a description of the methods of preparing and mounting objects, etc.
Griffith, J. W. (John William)
397 Gutenberg downloadsen2015Difficulty 52 (Graduate)
Dissection of the Platana and the Frog
Gilchrist, J. D. F. (John Dow Fisher) & Bonde, Cecil von
397 Gutenberg downloadsen2015Difficulty 51 (Graduate)
Louis Agassiz as a Teacher; illustrative extracts on his method of instruction
Cooper, Lane
397 Gutenberg downloadsen2004Difficulty 56 (Graduate)
Natur und Mensch Sechs Abschnitte aus Werken von Ernst Haeckel
Haeckel, Ernst
397 Gutenberg downloadsde2015
Poisonous Snakes of Kansas
Clarke, Robert F. (Robert Francis)
397 Gutenberg downloadsen2019Difficulty 50 (College)
Arabische Pflanzennamen aus Aegypten, Algerien und Jemen
Schweinfurth, Georg August
396 Gutenberg downloadsde2024
Dairy Disagreeables Busy the Bacteriologists
Hall, Frank H. (Frank Henry) & Harding, Harry Alexis & Rogers, L. A. (Lore Alford) & Smith, George A.
396 Gutenberg downloadsen2022Difficulty 56 (Graduate)
Illustrations of Exotic Entomology, Volume 2
Drury, Dru
396 Gutenberg downloadsen2014Difficulty 55 (Graduate)
Last Words on Evolution: A Popular Retrospect and Summary
Haeckel, Ernst
395 Gutenberg downloadsen2016Difficulty 68 (Academic)
Rede, gehalten bei der Eröffnung der Versammlung deutscher Naturforscher und Ärzte in Berlin, am 18. September 1828
Humboldt, Alexander von
395 Gutenberg downloadsde2007
Geographic Variation in the Pocket Gopher, Thomomys bottae, in Colorado
Youngman, Phillip M.
394 Gutenberg downloadsen2011Difficulty 57 (Graduate)
Het Leven der Dieren: Deel 1, Hoofdstuk 01: De Apen
Brehm, Alfred Edmund
394 Gutenberg downloadsnl2005
De Reis om de Wereld
Darwin, Charles
393 Gutenberg downloadsnl2010
Natural History of the Bell Vireo, Vireo bellii Audubon
Barlow, Jon C.
393 Gutenberg downloadsen2010Difficulty 59 (Graduate)
Colouration in Animals and Plants
Tylor, Alfred
392 Gutenberg downloadsen2014Difficulty 56 (Graduate)
Flytraps and Their Operation [1930]
Bishopp, F. C. (Fred Corry)
392 Gutenberg downloadsen2020Difficulty 51 (Graduate)
Middle American Frogs of the Hyla microcephala Group
Duellman, William Edward & Fouquette, M. J.
392 Gutenberg downloadsen2010Difficulty 66 (Academic)
Report on the Migration of Birds in the Autumn of 1879. [First Report]
Harvie-Brown, J. A. (John Alexander) & Cordeaux, John
392 Gutenberg downloadsen2021Difficulty 40 (High School)
The Bedbug [1934]
Marlatt, C. L.
392 Gutenberg downloadsen2020Difficulty 62 (Academic)
Radioisotopes and Life Processes (Revised)
Kisieleski, Walter E. & Baserga, Renato
391 Gutenberg downloadsen2015Difficulty 66 (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
391 Gutenberg downloadsen2021Difficulty 41 (College)
Researches on the Visual Organs of the Trilobites
Lindström, Gustaf
391 Gutenberg downloadsen2022Difficulty 54 (Graduate)
Useful Knowledge: Volume 3. Animals Or, a familiar account of the various productions of nature
Bingley, William
391 Gutenberg downloadsen2018Difficulty 54 (Graduate)
Birds from Coahuila, Mexico
Urban, Emil K.
390 Gutenberg downloadsen2008Difficulty 55 (Graduate)
Pflanzenleben in Feld und Garten
Buckley, Arabella B. (Arabella Burton)
390 Gutenberg downloadsde2022
Prehistoric man
Duckworth, W. L. H. (Wynfrid Laurence Henry)
390 Gutenberg downloadsen2013Difficulty 57 (Graduate)
Scientific American Supplement, No. 794, March 21, 1891
Various
390 Gutenberg downloadsen2005Difficulty 52 (Graduate)
The Brain, A Decoded Enigma
Moisa, Dorin Teodor
390 Gutenberg downloadsen2005Difficulty 58 (Graduate)
A conchological manual
Sowerby, G. B. (George Brettingham)
389 Gutenberg downloadsen2013Difficulty 64 (Academic)
A New Subspecies of Lizard, Cnemidophorus sacki, from Michoacán, México
Duellman, William Edward
389 Gutenberg downloadsen2010Difficulty 58 (Graduate)
The American Bee Journal, Volume VI, Number 3, September 1870
Various
389 Gutenberg downloadsen2018Difficulty 56 (Graduate)
Einheimische Fische; Die Süßwasserfische unsrer Heimat
Floericke, Kurt
388 Gutenberg downloadsde2012
Schutz- und Trutzbündnisse in der Natur
Bölsche, Wilhelm
388 Gutenberg downloadsde2015
The botanist's repository for new and rare plants; vol. 06 [of 10]
Andrews, Henry Cranke, active 1799-1828
388 Gutenberg downloadsen2024Difficulty 63 (Academic)
The Doctrine of Evolution: Its Basis and Its Scope
Crampton, Henry Edward
388 Gutenberg downloadsen2005Difficulty 65 (Academic)
The flowering plants of South Africa; vol. 2
Unknown
388 Gutenberg downloadsen2021Difficulty 51 (Graduate)
Woher die Kindlein kommen
Hoppeler, Hans
388 Gutenberg downloadsde2009
Aspects of plant life; with special reference to the British flora
Praeger, R. Lloyd (Robert Lloyd)
387 Gutenberg downloadsen2018Difficulty 59 (Graduate)
Eugenics as a Factor in the Prevention of Mental Disease
Pollock, Horatio M. (Horatio Milo)
387 Gutenberg downloadsen2011Difficulty 65 (Academic)
The Behavior of the Honey Bee in Pollen Collecting
Casteel, Dana Brackenridge
387 Gutenberg downloadsen2012Difficulty 54 (Graduate)
The Ohio Naturalist, vol. II, no. 2, December, 1901
Ohio State University. Biological Club
387 Gutenberg downloadsen2023Difficulty 64 (Academic)
A Review of the Middle American Tree Frogs of the Genus Ptychohyla
Duellman, William Edward
386 Gutenberg downloadsen2011Difficulty 58 (Graduate)
Pipistrellus cinnamomeus Miller 1902 Referred to the Genus Myotis
Hall, E. Raymond (Eugene Raymond) & Dalquest, Walter Woelber
386 Gutenberg downloadsen2010Difficulty 55 (Graduate)
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
Behring, Emil von
386 Gutenberg downloadsen2023Difficulty 67 (Academic)
Time and Life: Mr. Darwin's "Origin of Species"
Huxley, Thomas Henry
386 Gutenberg downloadsen2001Difficulty 72 (Expert)
Flowers of mountain and plain
Clements, Edith S. (Edith Schwartz)
385 Gutenberg downloadsen2014Difficulty 50 (College)
Notes on Veterinary Anatomy
Korinek, Charles James
385 Gutenberg downloadsen2019Difficulty 53 (Graduate)
The Nautilus. Vol. XXXI, No. 2, October 1917 A Quarterly Journal Devoted to the Interests of Conchologists
Various
385 Gutenberg downloadsen2019Difficulty 52 (Graduate)
An elementary manual of New Zealand entomology : $b being an introduction to the study of our native insects
Hudson, G. V. (George Vernon)
384 Gutenberg downloadsen2013Difficulty 54 (Graduate)
Aus dem Leben der Insekten
Buckley, Arabella B. (Arabella Burton)
384 Gutenberg downloadsde2022
Histoire naturelle des oiseaux d'Afrique, t. 1
Le Vaillant, François
384 Gutenberg downloadsfr2018
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)
384 Gutenberg downloadsfr2025
Scientific American Supplement, No. 613, October 1, 1887
Various
384 Gutenberg downloadsen2005Difficulty 63 (Academic)
A Monograph of Odontoglossum
Bateman, Jas. (James)
383 Gutenberg downloadsen2014Difficulty 61 (Academic)
The Ohio Naturalist, Vol. I, No. 7, May, 1901
Ohio State University. Biological Club
383 Gutenberg downloadsen2023Difficulty 51 (Graduate)
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
382 Gutenberg downloadsen2006Difficulty 57 (Graduate)
A Taxonomic Study of the Middle American Snake, Pituophis deppei
Duellman, William Edward
382 Gutenberg downloadsen2010Difficulty 58 (Graduate)
Het paddenstoelenboekje
Cool, Cath. (Catharina) & Lek, H. A. A. van der (Hendrik Adrianus Abraham)
382 Gutenberg downloadsnl2015
Little Wanderers
Morley, Margaret Warner
382 Gutenberg downloadsen2020Difficulty 41 (College)
Occurrence of the Garter Snake, Thamnophis sirtalis, in the Great Plains and Rocky Mountains
Fitch, Henry S. (Henry Sheldon) & Maslin, T. Paul
382 Gutenberg downloadsen2010Difficulty 66 (Academic)
The Forest Habitat of the University of Kansas Natural History Reservation
Fitch, Henry S. (Henry Sheldon) & McGregor, Ronald L.
382 Gutenberg downloadsen2010Difficulty 59 (Graduate)
Marxism and Darwinism : $b Evidence, speeches, and papers in its favour
Pannekoek, Anton
381 Gutenberg downloadsen2023Difficulty 58 (Graduate)
Mushrooms of America, Edible and Poisonous
Unknown
381 Gutenberg downloadsen2009Difficulty 49 (College)
Sphinx Vespiformis: An Essay
Newman, Edward
381 Gutenberg downloadsen2013Difficulty 73 (Expert)
Systematics of Megachiropteran Bats in the Solomon Islands
Phillips, Carleton J.
381 Gutenberg downloadsen2012Difficulty 58 (Graduate)
The Anatomy of Vegetables Begun With a General Account of Vegetation founded thereon
Grew, Nehemiah
381 Gutenberg downloadsen2018Difficulty 48 (College)
The History of the European Fauna
Scharff, R. F. (Robert Francis)
381 Gutenberg downloadsen2010Difficulty 61 (Academic)
Use of the Dead to the Living
Smith, Southwood
381 Gutenberg downloadsen2018Difficulty 67 (Academic)
Geographic Range of the Hooded Skunk, Mephitis macroura With Description of a New Subspecies from Mexico
Hall, E. Raymond (Eugene Raymond) & Dalquest, Walter Woelber
380 Gutenberg downloadsen2010Difficulty 57 (Graduate)
Subspeciation in Pocket Gophers of Kansas, [KU. Vol. 1 No. 11]
Villa Ramírez, Bernardo & Hall, E. Raymond (Eugene Raymond)
380 Gutenberg downloadsen2011Difficulty 58 (Graduate)
The Subspecies of the Mountain Chickadee
Grinnell, Joseph
380 Gutenberg downloadsen2010Difficulty 50 (College)
Popular Lectures on Zoonomia Or The Laws of Animal Life, in Health and Disease
Garnett, Thomas
379 Gutenberg downloadsen2009Difficulty 59 (Graduate)
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.
379 Gutenberg downloadsen2008Difficulty 52 (Graduate)
A Critique of the Theory of Evolution
Morgan, Thomas Hunt
378 Gutenberg downloadsen2009Difficulty 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
378 Gutenberg downloadsen2014Difficulty 50 (College)
Die Naturwissenschaften in ihrer Entwicklung und in ihrem Zusammenhange, I. Band Von den Anfängen bis zum Wiederaufleben der Wissenschaften
Dannemann, Friedrich
377 Gutenberg downloadsde2016
The Systematic Status of Eumeces pluvialis Cope
Smith, Hobart M. (Hobart Muir)
377 Gutenberg downloadsen2011Difficulty 60 (Graduate)
Treatise on the Anatomy and Physiology of the Mucous Membranes With Illustrative Pathological Observations
Bichat, Xavier
377 Gutenberg downloadsen2016Difficulty 67 (Academic)
Carlo Darwin
Lessona, Michele
376 Gutenberg downloadsit2014
Death and resurrection from the point of view of the cell-theory
Björklund, Gustaf
376 Gutenberg downloadsen2019Difficulty 58 (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
376 Gutenberg downloadsen2010Difficulty 49 (College)
Sir William Flower
Lydekker, Richard
376 Gutenberg downloadsen2025Difficulty 72 (Expert)
Evolution: An Investigation and a Critique
Graebner, Theodore
375 Gutenberg downloadsen2006Difficulty 62 (Academic)
The Kansas University Quarterly, Vol. I, No. 1 (1892)
Various
375 Gutenberg downloadsen2017Difficulty 58 (Graduate)
The modes of origin of lowest organisms including a discussion of the experiments of M. Pasteur
Bastian, H. Charlton
375 Gutenberg downloadsen2015Difficulty 71 (Expert)
The Ohio Journal of Science, Vol. XVI, No. 1, November 1915
Various
375 Gutenberg downloadsen2017Difficulty 50 (College)
A New Extinct Emydid Turtle from the Lower Pliocene of Oklahoma
Galbreath, Edwin C. (Edwin Carter)
374 Gutenberg downloadsen2010Difficulty 59 (Graduate)
A Treatise of Buggs
Southall, John
374 Gutenberg downloadsen2015Difficulty 56 (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
374 Gutenberg downloadsen2011Difficulty 49 (College)
Μικρά Φυσικά, Τόμος Πρώτος
Aristotle
374 Gutenberg downloadsel2009
A Discourse on the Plague
Mead, Richard
373 Gutenberg downloadsen2010Difficulty 61 (Academic)
A Field Study of the Kansas Ant-Eating Frog, Gastrophryne olivacea
Fitch, Henry S. (Henry Sheldon)
373 Gutenberg downloadsen2010Difficulty 55 (Graduate)
A Quantitative Study of the Nocturnal Migration of Birds
Lowery, George H., Jr.
373 Gutenberg downloadsen2011Difficulty 55 (Graduate)
Beautiful Ferns
Eaton, Daniel Cady
373 Gutenberg downloadsen2014Difficulty 58 (Graduate)
Descripción Geografica, Histórica y Estadística de Bolivia, Tomo 1.
Orbigny, Alcide Dessalines d'
373 Gutenberg downloadses2004
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
373 Gutenberg downloadsen2022Difficulty 64 (Academic)
Scientific American Supplement, No. 664, September 22,1888
Various
373 Gutenberg downloadsen2008Difficulty 58 (Graduate)
The Mammals of Warren Woods, Berrien County, Michigan Occasional Paper of the Museum of Zoology, Number 86
Dice, Lee R. (Lee Raymond)
373 Gutenberg downloadsen2010Difficulty 49 (College)
Adequate Preparation for the Teacher of Biological Sciences in Secondary Schools
McDonald, J. Daley (James Daley)
372 Gutenberg downloadsen2010Difficulty 64 (Academic)
Alpine flora of the Canadian Rocky Mountains
Brown, Stewardson
372 Gutenberg downloadsen2025Difficulty 60 (Graduate)
Field Mice as Farm and Orchard Pests
Lantz, David E. (David Ernest)
372 Gutenberg downloadsen2013Difficulty 54 (Graduate)
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
372 Gutenberg downloadsen2019Difficulty 48 (College)
A Monograph of the Trilobites of North America: with Coloured Models of the Species
Green, Jacob
371 Gutenberg downloadsen2021Difficulty 63 (Academic)
A New Genus of Pennsylvanian Fish (Crossopterygii, Coelacanthiformes) from Kansas
Echols, Joan
371 Gutenberg downloadsen2010Difficulty 60 (Graduate)
El Campesino Puertorriqueño Sus Condiciones Físicas, Intelectuales y Morales, Causas que la Determinan y Medios Para Mejorarlas
Valle Atiles, Francisco del
371 Gutenberg downloadses2015
Profitable poultry : $b Their management in health and disease
Tegetmeier, W. B. (William Bernhard)
371 Gutenberg downloadsen2024Difficulty 65 (Academic)
Uit de dierenwereld van het water Schetsen in woord en beeld van het lever der lagere diersoorten
Snijders, A. J. C. (Anthony J. C.)
371 Gutenberg downloadsnl2022
Whale Primer, with Special Attention to the California Gray Whale
Walker, Theodore J.
371 Gutenberg downloadsen2019Difficulty 55 (Graduate)
Bananas: Nature's Institution for the Promotion of Laziness
Perry, Edward Wilkin
370 Gutenberg downloadsen2017Difficulty 52 (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
370 Gutenberg downloadsen2016Difficulty 49 (College)
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
370 Gutenberg downloadsen2017Difficulty 61 (Academic)
The illustrated story of evolution
Gauvin, Marshall J. (Marshall Jerome)
370 Gutenberg downloadsen2023Difficulty 54 (Graduate)
Het Leven der Dieren: Hoofdstuk 7: De Pluviervogels
Brehm, Alfred Edmund
369 Gutenberg downloadsnl2010
Morphological Variation in a Population of the Snake, Tantilla gracilis Baird and Girard
Hardy, Laurence M. & Cole, Charles J.
369 Gutenberg downloadsen2010Difficulty 55 (Graduate)
The American Apiculturist. Vol. III. No. 6, June 15, 1885 A Journal Devoted to Scientific and Practical Beekeeping
Various
369 Gutenberg downloadsen2018Difficulty 54 (Graduate)
The Vitamine Manual
Eddy, Walter Hollis
369 Gutenberg downloadsen2005Difficulty 58 (Graduate)
Descripção de algumas especies novas ou pouco conhecidas de crustaceos e arachnidios de Portugal e possessões portuguezas do ultramar
Capello, Felix Antonio de Brito
368 Gutenberg downloadsfr2010
Essays on Darwinism
Stebbing, Thomas Roscoe Rede
368 Gutenberg downloadsen2015Difficulty 63 (Academic)
Physiology and histology of the Cubomedusæ including Dr. F.S. Conant's notes on the physiology
Berger, E. W. (Edward William)
368 Gutenberg downloadsen2017Difficulty 62 (Academic)
The American Bee Journal, Vol. VI., Number 5, November 1870
Various
368 Gutenberg downloadsen2018Difficulty 53 (Graduate)
The genetic and the operative evidence relating to secondary sexual characters
Morgan, Thomas Hunt
368 Gutenberg downloadsen2018Difficulty 47 (College)
The Microscope
Ross, Andrew
368 Gutenberg downloadsen2013Difficulty 65 (Academic)
The Protection of Fresh-Water Mussels
Coker, R. E. (Robert Ervin)
368 Gutenberg downloadsen2013Difficulty 65 (Academic)
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
367 Gutenberg downloadsen2010Difficulty 54 (Graduate)
Leprosy : $b in its clinical & pathological aspects
Hansen, G. Armauer (Gerhard Armauer) & Looft, Carl
367 Gutenberg downloadsen2023Difficulty 64 (Academic)
Proceedings of the California Academy of Sciences, Series 3, Volume 4 (Zoology)
Various
367 Gutenberg downloadsen2017Difficulty 70 (Academic)
Schenk's Theory: The Determination of Sex
Schenk, Samuel Leopold
367 Gutenberg downloadsen2014Difficulty 59 (Graduate)
The Forests of Mount Rainier National Park
Allen, G. F. (Grenville F.)
367 Gutenberg downloadsen2010Difficulty 49 (College)
An Attempt to Investigate the Seat of Animal Life
Curtis, Henry
366 Gutenberg downloadsen2021Difficulty 71 (Expert)
Aspects of Reproduction and Development in the Prairie Vole (Microtus ochrogaster)
Fitch, Henry S. (Henry Sheldon)
366 Gutenberg downloadsen2011Difficulty 60 (Graduate)
Birds and Nature Vol. 09 No. 3 [March 1901]
Various
366 Gutenberg downloadsen2014Difficulty 54 (Graduate)
Het Leven der Dieren: Deel 2, Hoofdstuk 04: De Hoendervogels
Brehm, Alfred Edmund
366 Gutenberg downloadsnl2009
Studies of Birds Killed in Nocturnal Migration
Tordoff, Harrison Bruce & Mengel, Robert Morrow
366 Gutenberg downloadsen2016Difficulty 54 (Graduate)
The Cubomedusæ
Conant, Franklin Story
366 Gutenberg downloadsen2017Difficulty 60 (Graduate)
The Mammals of Washtenaw County, Michigan Occasional Papers of the Museum of Zoology, No. 123
Wood, Norman Asa
366 Gutenberg downloadsen2010Difficulty 44 (College)
The Periodical Cicada, "the 17-year Locust"
United States. Department of Agriculture
366 Gutenberg downloadsen2019Difficulty 51 (Graduate)
Fish Populations, Following a Drought, in the Neosho and Marais des Cygnes Rivers of Kansas
Deacon, James E.
365 Gutenberg downloadsen2010Difficulty 52 (Graduate)
Natural History of the Prairie Vole (Mammalian Genus Microtus) [KU. Vol. 1 No. 7]
Jameson, E. W. (Everett Williams)
365 Gutenberg downloadsen2011Difficulty 52 (Graduate)
The Meaning of Infancy
Fiske, John
365 Gutenberg downloadsen2004Difficulty 62 (Academic)
Bird studies with a camera : $b with introductory chapters on the outfit and methods of the bird photographer
Chapman, Frank M. (Frank Michler)
364 Gutenberg downloadsen2025Difficulty 50 (College)
Ohio Biological Survey, Bull. 10, Vol. 11, No. 6 The Ascomycetes of Ohio IV and V
Fink, Bruce & Hilker, Leafy Jane Corrington
364 Gutenberg downloadsen2006Difficulty 58 (Graduate)
Darwinism. The Noachian Flood A lecture delivered before the Torquay Natural History Society, Jan. 31st, 1870
Stebbing, Thomas Roscoe Rede
363 Gutenberg downloadsen2021Difficulty 68 (Academic)
Archimedes; or, the future of physics
Whyte, Lancelot Law
362 Gutenberg downloadsen2025Difficulty 66 (Academic)
The Science of Animal Locomotion (Zoopraxography) An Electro-Photographic Investigation of Consecutive Phases of Animal Movements
Muybridge, Eadweard
362 Gutenberg downloadsen2012Difficulty 65 (Academic)
Type specimens of amphibians and reptiles in the Museum of Natural History, the University of Kansas
Duellman, William Edward & Berg, Barbara
362 Gutenberg downloadsen2024Difficulty 56 (Graduate)
A New Subspecies of the Black Myotis (Bat) from Eastern Mexico
Hall, E. Raymond (Eugene Raymond) & Alvarez, Ticul
361 Gutenberg downloadsen2008Difficulty 55 (Graduate)
Blonde duinen
Thijsse, Jac. P. (Jacobus Pieter)
360 Gutenberg downloadsnl2025
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
360 Gutenberg downloadsfr2010
The Genera of Phyllomedusine Frogs (Anura: Hylidae)
Duellman, William Edward
360 Gutenberg downloadsen2010Difficulty 74 (Expert)
Degeneration: A Chapter in Darwinism
Lankester, E. Ray (Edwin Ray), Sir
359 Gutenberg downloadsen2019Difficulty 66 (Academic)
The Christian Foundation, Or, Scientific and Religious Journal, Volume 1, Index, 1880
Various
359 Gutenberg downloadsen2009Difficulty 77 (Expert)
A Letter on Suspended Animation containing experiments shewing that it may be safely employed during operations on animals
Hickman, Henry Hill
358 Gutenberg downloadsen2018Difficulty 77 (Expert)
Fishes of Chautauqua, Cowley and Elk Counties, Kansas
Metcalf, Artie L.
358 Gutenberg downloadsen2010Difficulty 55 (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)
358 Gutenberg downloadsen2012Difficulty 60 (Graduate)
Observations on the Mississippi Kite in Southwestern Kansas
Fitch, Henry S. (Henry Sheldon)
358 Gutenberg downloadsen2010Difficulty 55 (Graduate)
Parasiten der Honigbiene und die durch dieselben bedingten Krankheiten dieses Insects.
Assmuss, Eduard Philibert
358 Gutenberg downloadsde2006
Summer Birds From the Yucatan Peninsula, Mexico
Klaas, Erwin E.
358 Gutenberg downloadsen2011Difficulty 52 (Graduate)
Sweet-Clover Seed
Coe, H. S. & Martin, John N. (John Nathan)
358 Gutenberg downloadsen2020Difficulty 60 (Graduate)
Zoological Illustrations, Second Series, Volume 1 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
358 Gutenberg downloadsen2013Difficulty 59 (Graduate)
Coloured engravings of heaths; vol. 4
Andrews, Henry Cranke, active 1799-1828
357 Gutenberg downloadsen2023Difficulty 60 (Graduate)
The Methods and Scope of Genetics An inaugural lecture delivered 23 October 1908
Bateson, William
357 Gutenberg downloadsen2016Difficulty 60 (Graduate)
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
357 Gutenberg downloadsen2015Difficulty 67 (Academic)
A New Doglike Carnivore, Genus Cynarctus, From the Clarendonian, Pliocene, of Texas
Hall, E. Raymond (Eugene Raymond) & Dalquest, Walter Woelber
356 Gutenberg downloadsen2009Difficulty 53 (Graduate)
Journal of Entomology and Zoology, Vol. 11, No. 2, June 1919
Various
356 Gutenberg downloadsen2010Difficulty 54 (Graduate)
Studies in Spermatogenesis (Part 1 of 2)
Stevens, N. M. (Nettie Maria)
356 Gutenberg downloadsen2010Difficulty 57 (Graduate)
Synopsis of Some Genera of the Large Pyrenomycetes Camillea, Thamnomyces, Engleromyces
Lloyd, C. G. (Curtis Gates)
356 Gutenberg downloadsen2007Difficulty 52 (Graduate)
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Smith, Hobart M. (Hobart Muir)
355 Gutenberg downloadsen2010Difficulty 46 (College)
Records of the Fossil Mammal Sinclairella, Family Apatemyidae, From the Chadronian and Orellan
Clemens, William A. (William Alvin)
355 Gutenberg downloadsen2009Difficulty 57 (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)
354 Gutenberg downloadsen2024Difficulty 66 (Academic)
Humboldt From 'The Gods and Other Lectures'
Ingersoll, Robert Green
354 Gutenberg downloadsen2011Difficulty 62 (Academic)
The Salmon Fishery of Penobscot Bay and River in 1895-96
Smith, Hugh M. (Hugh McCormick)
354 Gutenberg downloadsen2005Difficulty 48 (College)
A Defence of the Inquiry into Mesmerism & Phrenology chiefly in relation to recent events in Lynn
Armes, William
353 Gutenberg downloadsen2017Difficulty 66 (Academic)
A New Bat (Myotis) From Mexico
Hall, E. Raymond (Eugene Raymond)
353 Gutenberg downloadsen2010Difficulty 57 (Graduate)
Het Leven der Dieren: Deel 1, Hoofdstuk 04: De Roofdieren
Brehm, Alfred Edmund
353 Gutenberg downloadsnl2006
A New Subspecies of the Fruit-eating Bat, Sturnira ludovici, From Western Mexico
Jones, J. Knox & Phillips, Gary L.
352 Gutenberg downloadsen2010Difficulty 55 (Graduate)
De afstamming van den mensch en de seksueele teeltkeus, deel 2 (van 2)
Darwin, Charles
352 Gutenberg downloadsnl2024
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Duncan, James
352 Gutenberg downloadsen2018Difficulty 56 (Graduate)
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Wallace, Alfred Russel
352 Gutenberg downloadsen2023Difficulty 62 (Academic)
Unsere Haustiere vom Standpunkte ihrer wilden Verwandten
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352 Gutenberg downloadsde2018
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352 Gutenberg downloadsde2022
A New Species of Heteromyid Rodent from the Middle Oligocene of Northeast Colorado with Remarks on the Skull
Galbreath, Edwin C. (Edwin Carter)
351 Gutenberg downloadsen2010Difficulty 57 (Graduate)
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351 Gutenberg downloadsen2022Difficulty 53 (Graduate)
De la télépathie: Étude sur la transmission de la pensée
Hureau, Émile
351 Gutenberg downloadsfr2006
La philosophie zoologique avant Darwin
Perrier, Edmond
351 Gutenberg downloadsfr2010
Reise in die Aequinoctial-Gegenden des neuen Continents. Band 4.
Humboldt, Alexander von
351 Gutenberg downloadsde2012
Saunders' Books on Pathology, Physiology Histology, Embryology and Bacteriology
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351 Gutenberg downloadsen2017Difficulty 61 (Academic)
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Andrews, Henry Cranke, active 1799-1828
351 Gutenberg downloadsen2023Difficulty 56 (Graduate)
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351 Gutenberg downloadsen2009Difficulty 64 (Academic)
The O. S. U. Naturalist, Vol. 1, No. 1, November, 1900
Ohio State University. Biological Club
351 Gutenberg downloadsen2017Difficulty 56 (Graduate)
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Selander, Robert K. & Johnston, Richard F. & Raun, Gerald G. & Wilks, B. J.
351 Gutenberg downloadsen2011Difficulty 54 (Graduate)
Zoological Illustrations, Volume 3 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
351 Gutenberg downloadsen2012Difficulty 60 (Graduate)
A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, México
Duellman, William Edward
350 Gutenberg downloadsen2011Difficulty 65 (Academic)
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350 Gutenberg downloadsen2010Difficulty 57 (Graduate)
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350 Gutenberg downloadsen2016Difficulty 60 (Graduate)
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350 Gutenberg downloadsen2020Difficulty 65 (Academic)
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350 Gutenberg downloadsen2019Difficulty 69 (Academic)
A New Pocket Gopher (Thomomys) and A New Spiny Pocket Mouse (Liomys) from Michoacán, Mexico
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349 Gutenberg downloadsen2010Difficulty 60 (Graduate)
Im Zauber des Tierlebens
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349 Gutenberg downloadsde2024
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348 Gutenberg downloadsen2010Difficulty 61 (Academic)
Aus Natur und Geisteswelt Sammlung wissenschaftlich-gemeinverständlicher Darstellungen aus allen Gebieten des Wissens
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348 Gutenberg downloadsde2016
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Clarke, John Mason
348 Gutenberg downloadsen2022Difficulty 60 (Graduate)
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Roosevelt, Theodore
347 Gutenberg downloadsen2023Difficulty 70 (Academic)
Comments on the Taxonomy and Geographic Distribution of Some North American Marsupials, Insectivores and Carnivores
Hall, E. Raymond (Eugene Raymond) & Kelson, Keith R.
347 Gutenberg downloadsen2010Difficulty 58 (Graduate)
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Minckley, W. L.
347 Gutenberg downloadsen2011Difficulty 47 (College)
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Howard, L. O. (Leland Ossian)
347 Gutenberg downloadsen2019Difficulty 56 (Graduate)
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347 Gutenberg downloadsfr2020
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347 Gutenberg downloadsen2010Difficulty 47 (College)
Memorias sobre a influencia dos descobrimentos portuguezes no conhecimento das plantas I. - Memoria sobre a Malagueta
Ficalho, Francisco Manuel de Melo, Conde de
347 Gutenberg downloadspt2009
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Hall, E. Raymond (Eugene Raymond) & Jones, J. Knox
347 Gutenberg downloadsen2010Difficulty 59 (Graduate)
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Jenkinson, Marion Anne
347 Gutenberg downloadsen2010Difficulty 64 (Academic)
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Bölsche, Wilhelm
346 Gutenberg downloadshu2022
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Lantz, David E. (David Ernest)
346 Gutenberg downloadsen2014Difficulty 54 (Graduate)
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Dannemann, Friedrich
345 Gutenberg downloadsde2018
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344 Gutenberg downloadsnl2020
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343 Gutenberg downloadsen2023Difficulty 56 (Graduate)
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343 Gutenberg downloadsen2014Difficulty 55 (Graduate)
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342 Gutenberg downloadsnl2021
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Webb, Robert G. (Robert Gravem)
342 Gutenberg downloadsen2010Difficulty 60 (Graduate)
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342 Gutenberg downloadsen2011Difficulty 56 (Graduate)
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Anderson, Sydney
342 Gutenberg downloadsen2011Difficulty 64 (Academic)
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341 Gutenberg downloadsen2010Difficulty 56 (Graduate)
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341 Gutenberg downloadsnl2017
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341 Gutenberg downloadsen2009Difficulty 53 (Graduate)
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341 Gutenberg downloadsen2010Difficulty 47 (College)
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341 Gutenberg downloadsen2011Difficulty 59 (Graduate)
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341 Gutenberg downloadsen2022Difficulty 52 (Graduate)
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341 Gutenberg downloadsen2009Difficulty 64 (Academic)
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341 Gutenberg downloadsde2022
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340 Gutenberg downloadsla2012
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340 Gutenberg downloadsen2011Difficulty 51 (Graduate)
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340 Gutenberg downloadsen2015Difficulty 74 (Expert)
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Combe, George
339 Gutenberg downloadsen2009Difficulty 58 (Graduate)
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339 Gutenberg downloadsen2021Difficulty 61 (Academic)
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338 Gutenberg downloadsen2024Difficulty 67 (Academic)
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338 Gutenberg downloadsen2015Difficulty 66 (Academic)
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Brehm, Alfred Edmund
338 Gutenberg downloadsnl2009
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338 Gutenberg downloadsen2019Difficulty 55 (Graduate)
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338 Gutenberg downloadsen2010Difficulty 50 (College)
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337 Gutenberg downloadsen2012Difficulty 55 (Graduate)
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337 Gutenberg downloadsen2009Difficulty 55 (Graduate)
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337 Gutenberg downloadsen2010Difficulty 59 (Graduate)
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336 Gutenberg downloadsen2023Difficulty 50 (College)
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336 Gutenberg downloadsnl2007
The Florist and Horticultural Journal, Vol. II. No. 7, July, 1853 A Monthly Magazine of Horticulture, Agriculture, Botany, Agricultural Chemistry, Entomology, &c.
Various
336 Gutenberg downloadsen2018Difficulty 55 (Graduate)
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335 Gutenberg downloadsen2016Difficulty 75 (Expert)
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335 Gutenberg downloadsen2011Difficulty 66 (Academic)
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335 Gutenberg downloadsde2015
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335 Gutenberg downloadsde2013
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335 Gutenberg downloadsen2004Difficulty 50 (College)
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335 Gutenberg downloadsen2023Difficulty 57 (Graduate)
The heathery; or, A monograph of the genus Erica. vol. 2
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335 Gutenberg downloadsen2023Difficulty 54 (Graduate)
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334 Gutenberg downloadsen2009Difficulty 62 (Academic)
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334 Gutenberg downloadspt2012
The O. S. U. Naturalist, Vol. 1, No. 2, December, 1900
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334 Gutenberg downloadsen2023Difficulty 52 (Graduate)
The Ohio naturalist, Vol. 1, No. 8, June 1901
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334 Gutenberg downloadsen2022Difficulty 51 (Graduate)
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333 Gutenberg downloadsen2010Difficulty 57 (Graduate)
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333 Gutenberg downloadsen2020Difficulty 49 (College)
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333 Gutenberg downloadsen2011Difficulty 57 (Graduate)
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333 Gutenberg downloadsen2015Difficulty 56 (Graduate)
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333 Gutenberg downloadsen2014Difficulty 54 (Graduate)
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333 Gutenberg downloadsnl2023
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333 Gutenberg downloadsen2023Difficulty 58 (Graduate)
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332 Gutenberg downloadsen2011Difficulty 67 (Academic)
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332 Gutenberg downloadsen2009Difficulty 61 (Academic)
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331 Gutenberg downloadsen2010Difficulty 47 (College)
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331 Gutenberg downloadsen2010Difficulty 63 (Academic)
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330 Gutenberg downloadsen2022Difficulty 67 (Academic)
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330 Gutenberg downloadsen2023Difficulty 50 (College)
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330 Gutenberg downloadsen2024Difficulty 54 (Graduate)
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330 Gutenberg downloadsla2012
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329 Gutenberg downloadsen2007Difficulty 55 (Graduate)
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329 Gutenberg downloadsen2010Difficulty 42 (College)
Das Protoplasma der Rhizopoden und der Pflanzenzellen ein Beitrag zur Theorie der Zelle
Schultze, Max
329 Gutenberg downloadsde2022
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329 Gutenberg downloadsen2009Difficulty 55 (Graduate)
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328 Gutenberg downloadsde2016
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Alvarez, Ticul
328 Gutenberg downloadsen2010Difficulty 52 (Graduate)
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328 Gutenberg downloadsen2023Difficulty 56 (Graduate)
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327 Gutenberg downloadsnl2005
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327 Gutenberg downloadsnl2007
Illustrated Index of British Shells Containing figures of all the recent species
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327 Gutenberg downloadsen2013Difficulty 53 (Graduate)
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327 Gutenberg downloadsen2010Difficulty 55 (Graduate)
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327 Gutenberg downloadsen2011Difficulty 54 (Graduate)
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327 Gutenberg downloadsen2018Difficulty 56 (Graduate)
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327 Gutenberg downloadsen2019Difficulty 63 (Academic)
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327 Gutenberg downloadsen2010Difficulty 60 (Graduate)
A Population Study of the Prairie Vole (Microtus ochrogaster) in Northeastern Kansas
Martin, Edwin Perry
326 Gutenberg downloadsen2012Difficulty 61 (Academic)
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Chun, Carl
326 Gutenberg downloadsde2014
Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado
Douglas, Charles L.
326 Gutenberg downloadsen2012Difficulty 63 (Academic)
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326 Gutenberg downloadsen2016Difficulty 55 (Graduate)
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326 Gutenberg downloadsen2010Difficulty 58 (Graduate)
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326 Gutenberg downloadsit2005
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Anderson, Sydney
325 Gutenberg downloadsen2010Difficulty 51 (Graduate)
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325 Gutenberg downloadsen2010Difficulty 46 (College)
The Kansas University Science Bulletin, Vol. I, No. 2, February, 1902
Various
325 Gutenberg downloadsen2017Difficulty 52 (Graduate)
A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope
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324 Gutenberg downloadsen2011Difficulty 64 (Academic)
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324 Gutenberg downloadsnl2006
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Duellman, William Edward
324 Gutenberg downloadsen2010Difficulty 64 (Academic)
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White, John A.
324 Gutenberg downloadsen2010Difficulty 50 (College)
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324 Gutenberg downloadsde2018
Het Leven der Dieren: Deel 1, Hoofdstuk 07: De Knaagdieren
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323 Gutenberg downloadsnl2007
The Preparation of Bees for Outdoor Wintering
Phillips, Everett Franklin & Demuth, Geo. S. (George S.)
323 Gutenberg downloadsen2019Difficulty 53 (Graduate)
Zoological Illustrations, Volume 2 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
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323 Gutenberg downloadsen2012Difficulty 62 (Academic)
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322 Gutenberg downloadsnl2010
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United States. Public Health Service
322 Gutenberg downloadsen2023Difficulty 60 (Graduate)
The Hunterian lectures on colour-vision and colour-blindness
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322 Gutenberg downloadsen2025Difficulty 56 (Graduate)
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Blumenbach, Johann Friedrich
322 Gutenberg downloadsde2020
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)
321 Gutenberg downloadsen2016Difficulty 88 (Specialist)
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Andrews, Henry Cranke, active 1799-1828
321 Gutenberg downloadsen2023Difficulty 66 (Academic)
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Deacon, James E. & Metcalf, Artie L.
321 Gutenberg downloadsen2010Difficulty 45 (College)
On The Affinities of Leptarctus primus of Leidy American Museum of Natural History, Vol. VI, Article VIII, pp. 229-331.
Wortman, Jacob Lawson
321 Gutenberg downloadsen2008Difficulty 54 (Graduate)
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Bölsche, Wilhelm
320 Gutenberg downloadsnl2025
Notes on Diseases of Cattle: Cause, Symptoms and Treatment
Korinek, Charles James
320 Gutenberg downloadsen2019Difficulty 55 (Graduate)
De Wereld vóór de schepping van den mensch
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319 Gutenberg downloadsnl2006
I funghi mangerecci e velenosi dell'Europa media con speciale riguardo a quelli che crescono nel Trentino - II edizione riveduta ed aumentata
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319 Gutenberg downloadsit2013
A New Pocket Gopher (Genus Thomomys), from Eastern Colorado
Hall, E. Raymond (Eugene Raymond)
318 Gutenberg downloadsen2011Difficulty 60 (Graduate)
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)
318 Gutenberg downloadsen2008Difficulty 53 (Graduate)
Le Tour du Monde; Voyage d'un naturaliste. Journal des voyages et des voyageurs; 2. sem. 1860
Various
318 Gutenberg downloadsfr2008
A Guide for the Dissection of the Dogfish (Squalus Acanthias)
Griffin, Lawrence Edmonds
317 Gutenberg downloadsen2019Difficulty 54 (Graduate)
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317 Gutenberg downloadsen2011Difficulty 62 (Academic)
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317 Gutenberg downloadsfr2024
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315 Gutenberg downloadsla2010
The Botanical Magazine, Vol. 09 Or, Flower-Garden Displayed
Curtis, William
315 Gutenberg downloadsen2011Difficulty 58 (Graduate)
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Jones, J. Knox
314 Gutenberg downloadsen2010Difficulty 62 (Academic)
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314 Gutenberg downloadsen2010Difficulty 53 (Graduate)
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314 Gutenberg downloadsfr2025
Bees from British Guiana Bulletin of the AMNH, Vol. XXXVIII, Art. XX, pp. 685-690
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313 Gutenberg downloadsen2010Difficulty 55 (Graduate)
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313 Gutenberg downloadsnl2020
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313 Gutenberg downloadsen2018Difficulty 58 (Graduate)
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313 Gutenberg downloadsen2010Difficulty 64 (Academic)
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312 Gutenberg downloadsen2010Difficulty 60 (Graduate)
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