Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
John Henry Pepper
Museum of History and Technology
J. Malcolm Bird
Frank R. Stockton
Bertrand Russell
Sir Arthur Stanley Eddington
Galileo Galilei
Robert Hunt
Denison Olmsted
Robert P. Multhauf and Victor F. Lenzen
Dionysius Lardner and Henry Kater
Benjamin Harrow
Robert S. Ball
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William George Hooper
Richard A. Proctor
Erwin Freundlich
Charles Nordmann
Francis Penrose
James E. Gunn
Tullio Levi-Civita
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.