Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Paul Severing
United States. Congress. House. Committee on Science and Astronautics.
H. Irving Hancock
Bradley A. Fiske
James H. Brace and Francis Mason
William H. Burr
Eugene Klapp
David Stevenson
Frederic L. Paxson
Francis Lynde
G. R. G. Conway
Various
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W. B. Gregory
Henry Earle Riggs
Katharine Holland Brown
American Society of Civil Engineers
George Washington Rains
Edward Godfrey
J. C. Meem
Steven D. Smith and George J. Castille
Benjamin Franklin Cresson
Herbert M. Wilson
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.