Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Isaac Newton
Archibald Williams
Oliver Optic
Edward W. Byrn
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John Henry Pepper
William H. Doolittle
George Arnold and Frank Cahill
Thomas Young
Oliver Optic and Edward Stratemeyer
Cecil Henry Bullivant
Henri Poincaré
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.