Books in Biology (sorted by popularity)
- On the Origin of Species Charles Darwin 167 downloads
- The Human Side of Animals Royal Dixon 165 downloads
- My Studio Neighbors W. Hamilton Gibson 164 downloads
- The Life-Story of Insects George H. Carpenter 149 downloads
- Evolution in Modern Thought 143 downloads
- Fathers of Biology Charles McRae 136 downloads
- Ducks at a Distance: A Waterfowl Identification Guide Bob Hines 134 downloads
- Contributions to the Theory of Natural Selection Alfred Russel Wallace 124 downloads
- Text Book of Biology, Part 1: Vertebrata H. G. Wells 117 downloads
- Darwin and Modern Science A. C. Seward 116 downloads
- Nature Near London Richard Jefferies 113 downloads
- The Story of the Living Machine H. W. Conn 113 downloads
- Souvenirs entomologiques - Livre I (French) Jean-Henri Fabre 108 downloads
- The Foundations of the Origin of Species Charles Darwin 106 downloads
- Evolution, Old & New Samuel Butler 105 downloads
- Birds of Guernsey (1879) Cecil Smith 103 downloads
- Concerning Animals and Other Matters Edward Hamilton Aitken 98 downloads
- De l'origine des espèces (French) Charles Darwin 97 downloads
- Darwin, and After Darwin, Volumes 1 and 3 George John Romanes 92 downloads
- Species and Varieties, Their Origin by Mutation Hugo de Vries 91 downloads
- The Minds and Manners of Wild Animals: A Book of Personal Observations William T. Hornaday 89 downloads
- Darwiniana; Essays and Reviews Pertaining to Darwinism Asa Gray 87 downloads
- The Origin of Species Thomas Henry Huxley 86 downloads
- Parasiten der Honigbiene (German) Eduard Philibert Assmuss 85 downloads
- Lectures on Evolution Thomas Henry Huxley 83 downloads