Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Murray Leinster
Larry Sternig
Clifford D. Simak
John Martin
W. J. Matthews
Ray Cummings
Jerome Bixby
Bill Garson
Nelson S. Bond
Edmond Hamilton
Christopher Anvil
Carl Jacobi
Erwin Eggert
Neil R. Jones
Various
James McKimmey
Frank M. Robinson
Edward W. Ludwig
Randall Garrett and Robert Silverberg
Robert Abernathy
Donald Wandrei
A. L. Haley
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.