Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Charles Darwin
C. K. Leith
Sir Charles Lyell
John Muir
Henry Lawson
W. D. Westervelt
A. C. Seward
Thomas Henry Huxley
William Henry Matthews
James Hutton
Charles Kingsley
William Cathrall
Various
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Herbert Spencer
Gaston Tissandier
George Wharton James
Joseph McCabe
Louis Agassiz and Elizabeth Cabot Cary Agassiz
Robert Hunt
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.