Books in Biology (sorted by popularity)
- American Addresses, with a Lecture on the Study of Biology Thomas Henry Huxley 156 downloads
- The History of Insects Unknown 150 downloads
- The Origin of Species Thomas Henry Huxley 150 downloads
- Birds in Town & Village W. H. Hudson 149 downloads
- Ducks at a Distance: A Waterfowl Identification Guide Bob Hines 145 downloads
- Evolution in Modern Thought 136 downloads
- Fathers of Biology Charles McRae 135 downloads
- Contributions to the Theory of Natural Selection Alfred Russel Wallace 133 downloads
- De l'origine des espèces (French) Charles Darwin 133 downloads
- Development of the Digestive Canal of the American Alligator A. M. Reese 132 downloads
- Text Book of Biology, Part 1: Vertebrata H. G. Wells 127 downloads
- Darwin, and After Darwin, Volumes 1 and 3 George John Romanes 126 downloads
- Species and Varieties, Their Origin by Mutation Hugo de Vries 125 downloads
- The Foundations of the Origin of Species Charles Darwin 124 downloads
- Our Common Insects A. S. Packard 122 downloads
- Love's Meinie: Three Lectures on Greek and English Birds John Ruskin 122 downloads
- Darwin and Modern Science A. C. Seward 118 downloads
- Nouveaux souvenirs entomologiques - Livre II (French) Jean-Henri Fabre 114 downloads
- Souvenirs entomologiques - Livre I (French) Jean-Henri Fabre 112 downloads
- Life History of the Kangaroo Rat Charles Taylor Vorhies and Walter P. Taylor 111 downloads
- The Minds and Manners of Wild Animals: A Book of Personal Observations William T. Hornaday 110 downloads
- The Dawn of Reason; or, Mental Traits in the Lower Animals Jr. James Weir 106 downloads
- Nature Near London Richard Jefferies 104 downloads
- Evolution: An Investigation and a Critique Theodore Graebner 103 downloads
- Lectures on Evolution Thomas Henry Huxley 101 downloads