Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Plymouth Cordage Company
Wilhelm Ostwald
Mrs. Molesworth
Various
Ebenezer Cobham Brewer
Various and Royal Society
E. Stenhouse
United States. National Aeronautics and Space Administration
Asa Gray
William Swainson
George Grote
Murray Leinster
T. E. Thorpe
Ray Cummings
United States. Congress. House. Committee on Science and Astronautics.
Thomas Augustus Jaggar
Alfred Edmund Brehm
A. E. Dolbear
Ray Stannard Baker
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William Curtis
J. D. Beresford
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.