Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
James Croll
Durant Drake
August Weismann
Hiram Miner Stanley
kniaz Petr Alekseevich Kropotkin
Ernst Haeckel
Josephine Daskam Bacon
Samuel Butler
C. Lloyd Morgan
Thomas Henry Huxley
Annie Besant
Percival Lowell
Francis A. Collins
Walter Shaw Sparrow
Geo. W. Warder
Augustus Henry Lane-Fox Pitt-Rivers
James A. S. Watson
Charles Darwin
Brander Matthews
Sir James Augustus Henry Murray
Herbert Spencer
Douglas Dewar and Frank Finn
George McCready Price
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.