Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Charles Babbage
Stuart Dodgson Collingwood
David Hilbert
W. G. Waters
J. Wood Brown
John Adams
Florian Cajori
Robert J. Sawyer
Henry Stevens
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.