Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Various
Ray Bradbury
Denison Olmsted
E. E. Smith
Richard A. Proctor
John Wilkins
Andre Norton
H. Beam Piper
Jr. Sam Merwin
David Morrison and Jane Samz
II Victor Appleton
Marion Zimmer Bradley
Poul Anderson
Frank Belknap Long
Ralph Milne Farley
H. G. Wells
Stanley G. Weinbaum
Edgar Rice Burroughs
Svante Arrhenius
James Nasmyth and James Carpenter
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.