Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Linnean Society of London
Joseph Grinnell and Elizabeth Grinnell
Geoffrey Egerton-Warburton
Randolph Silliman Bourne
Richard Clynton
Joseph Dalton Hooker
Gordon Stables
Charles K. Reed
H. G. Adams
John Gould
John Ball
Edward Step
Edward Bartrum
United States. Public Health and Marine Hospital Service
George Wharton James
Various
John D. Lynch
George Cary Eggleston
Alfred Russel Wallace
Mrs. Alfred Sidgwick and Mrs. Paynter
Edmund Selous
Winthrop Packard
Samuel Cook
Ernst Haeckel
Enos A. Mills
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.