Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Florian Cajori
James Clerk Maxwell
St. George William Joseph Stock
W. W. Rouse Ball
Edward L. Thorndike
Auguste Comte
J. A. Zahm
active 3rd century-4th century Hui Liu
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John Phin
Gertrude Lowthian Bell
John Ruskin
Mary Wollstonecraft Shelley and James Montgomery
William Burnside
Kuo Shen
I. Todhunter
George Nichols Packer
George Biddell Airy
Cecilia Payne-Gaposchkin
Various
James Ferguson
Charles Babbage
Romeyn Henry Rivenburg
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.