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
John Martin
Dwight V. Swain
Noel M. Loomis
Fox B. Holden
James Blish
Theodore L. Thomas
Lester Del Rey
Randall Garrett
Leigh Brackett
Michael Shaara
Hank Searls
Milton A. Rothman
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.