Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
United States. War Department and United States. Army. Signal Corps
Sir A. E. Shipley
United States. Department of the Army
Various
James Blish
Sam McClatchie
Alfred Coppel
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.
