Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Thornton W. Burgess
Robert J. Russell
Phillip M. Youngman
E. Raymond Hall and Bernardo Villa Ramírez
Stephen David Durrant
E. Raymond Hall
Rollin H. Baker and Robert J. Russell
E. Raymond Hall and H. Gordon Montague
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.