Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
William T. Hornaday
L. David Mech, Louis Daniel Frenzel, Robert R. Ream, John W. Winship, and P. D. Karns
William Edward Duellman
Alfred Russel Wallace
William Wood
Dennis G. Rainey and Henry S. Fitch
Charles L. Douglas
Henry S. Fitch and Lewis L. Sandidge
Wilhelm Bölsche
Arabella B. Buckley
Charles C. Adams
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.