Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Adam Sedgwick, F. G. Sinclair, and David Sharp
Robert Hunt
G. Hartwig
Worthington Hooker
Alfred Edmund Brehm
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Julia McNair Wright
Various
Francis Gano Benedict and Thorne M. Carpenter
These books are free to read. Each is in the public domain in the United States; check your own country's rules before you copy or share one.