Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Leigh Brackett
Robert Silverberg
Ray Cummings
Evelyn E. Smith
Winston K. Marks
Raymond Z. Gallun
Stephen Tall
Robert W. Krepps
William Campbell Gault
Manly Wade Wellman
Rosel George Brown
William W. Stuart
Noel M. Loomis
Frank Belknap Long
Peter Baily
Murray Leinster
Wilbur S. Peacock
Roger D. Aycock
James Bell
Jack Williamson
Randall Garrett and Robert Silverberg
Hal Clement
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.