By A Mystery Man Writer
The study of animal life - Biodiversity Heritage Library
Re)visiting the 1837 Library of the Boston Society of Natural History, Part III
Public and Private Life of Animals (1877) — The Public Domain Review
File:Studies in animal life (IA studiesinanimal00lewe).pdf - Wikimedia Commons
File:Animal studies (1903) (18011661310).jpg - Wikimedia Commons
File:Image from page 211 of Brehm's Life of animals a complete natural history for popular home instruction and for the use of schools. Mammalia (1896) (20387032866).jpg - Wikimedia Commons
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