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