Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
William H. Burr
Eugene Klapp
David Stevenson
G. R. G. Conway
Various
W. B. Gregory
Henry Earle Riggs
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
John Logan Campbell
E. E. Fournier d'Albe
Mihai Nadin
Richard L. Maury
A. Kempkey
B. S. Randolph
Charles Minor Blackford
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.