Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Charles Darwin
Alexander von Humboldt
C. K. Leith
Sir Charles Lyell
John Muir
W. D. Westervelt
Henry Lawson
A. C. Seward
Thomas Henry Huxley
Wilhelm Bölsche
William Henry Matthews
James Hutton
William Cathrall
Charles Kingsley
Various
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Gaston Tissandier
Herbert Spencer
George Wharton James
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.