Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Willis E. Tower, Charles H. Smith, Charles M. Turton, and Thomas D. Cope
Henry Smith Williams and Edward Huntington Williams
Thomas Henry Huxley
Bertrand Russell
Henri Poincaré
Walter Libby
Algernon Blackwood
John Tyndall
Robert Boyle
Various
William Tyler Olcott
Lucius Annaeus Seneca
Galileo Galilei
David Hilbert
Jacob Abbott
E. Walter Maunder
Francis Bacon
Sir Arthur Stanley Eddington
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Maria Mitchell
J. H. Gladstone
Elmer Ellsworth Burns
J. P. Cole and Oliver Schoonmaker
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.