Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
George A. Romero
Willis E. Tower, Charles H. Smith, Charles M. Turton, and Thomas D. Cope
Robert Hunt
Max Planck
Isaac Asimov and Theodosius Dobzhansky
Elizabeth Cabot Cary Agassiz and Alexander Agassiz
Lawrence Radiation Laboratory
Arlo Bates
U.S. Army Ballistic Research Laboratory
Maynard Shipley
Niels Bohr
Percy Phillips
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.