Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Charles Babbage
Stuart Dodgson Collingwood
David Hilbert
W. G. Waters
John Adams
J. Wood Brown
Florian Cajori
Robert J. Sawyer
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Henry Stevens
Ernest Lebon
Magnus Gustaf Mittag-Leffler
Arthur Feldman
Charles E. Fritch
Alexander Macfarlane
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.