Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Frank Belknap Long
David Mason
George O. Smith
Murray Leinster
Leigh Richmond and Walt Richmond
Dwight V. Swain
John Martin
Noel M. Loomis
Michael Shaara
Fox B. Holden
James Blish
Theodore L. Thomas
Leigh Brackett
Randall Garrett
Lester Del Rey
Milton A. Rothman
Hank Searls
John L. Chapman
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.