Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Bertrand Russell
Niels Bohr
Arthur E. Bostwick
John Dalton
Mary Somerville
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Hendrik Anthony Kramers and Helge Holst
Maynard Shipley
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.