Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Archibald Williams
Robert Louis Stevenson
Dionysius Lardner
William Stanley Jevons
Alexander von Humboldt
Pansy
Elisha Gray
Richard A. Proctor
Fulgence Marion
J. Malcolm Bird
Mary Somerville
Willis E. Tower, Charles H. Smith, Charles M. Turton, and Thomas D. Cope
John Tyndall
Benjamin Franklin
Charles Hose and William McDougall
Sinclair Lewis
Sir James Emerson Tennent
Joseph H. Adams
M. E. Chevreul
Carl Ritter
Various
Bertrand Russell
R. Austin Freeman
Charles Babbage
Henry Smith Williams and Edward Huntington Williams
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.