Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Allen Chapman
Ernst Haeckel
Hanns Günther
Wayne Whipple and S. F. Aaron
Sara Ware Bassett
James R. Driscoll
Helen R. Hull
Walter Libby
Norman F. Joly
A. Frederick Collins
Marie Curie
Alfred Powell Morgan
Carl R. Maag and Steve Rohrer
Upton Sinclair
Lucien Poincaré
United States. Arms Control and Disarmament Agency
Ernest Rutherford
Fanny Walker Yeatman, Ruth Van Deman, and Consumer and Food Economics Institute
Walter Kellogg Towers
Franklin D. Roosevelt
Isaac Asimov and Theodosius Dobzhansky
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.