Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Tom Tit
Anton Pannekoek
Aletta H. Jacobs
Gaston Tissandier
W. Eekhoff and Jan Hendrik van Swinden
Herman Boerhaave
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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.