Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
R. M. Ballantyne
Arthur Quiller-Couch
Allen Kim Lang
William Clark Russell
Max Pemberton
H. Irving Hancock
William Henry Giles Kingston
Richard A. Proctor
Damon Knight
Luis Senarens
Maynard Shipley
Ilsien Nathalie Gaylord
Mary Raymond Shipman Andrews
Various
Horace Holden
Joaquin Miller
Stephen Marlowe
D. B. Bates
Randall Garrett and Robert Silverberg
Elijah Cobb
W. Gannon
Azel Ames
Daniel Defoe and Joachim Heinrich Campe
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.