Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Henry Walter Bates
Thomas Whiffen
Louis Agassiz and Elizabeth Cabot Cary Agassiz
William Lewis Herndon and Lardner Gibbon
Alfred Russel Wallace
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Leo E. Miller
Charles W. Domville-Fife
Algot Lange
Samuel Scoville
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.