Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Russell H. Conwell
Joseph Tinker
Robert Silverberg
Mari Wolf
Milton A. Rothman
George O. Smith
Marion Zimmer Bradley
R. R. Winterbotham
Frank Riley
Jr. Sam Merwin
Algis Budrys
Winston K. Marks
Charles D. Cunningham
Rosetta Luce Gilchrist
Neil J. Kenney
Charles E. Fritch
Norman Arkawy and Stanley Henig
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.