Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Niels Bohr
Isaac Asimov
United States. Maritime Administration, United States. Department of Commerce, and U.S. Atomic Energy Commission
Loyce J. McIlhenny
Edward Teller and Albert L. Latter
C. Jackson Craven
Neal O. Hines
Robert G. LeCompte and Burrell L. Wood
Bernice Kohn Hunt
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.