American Cryptology During the Cold War, 1945-1989
http://www.gwu.edu/~nsarchiv/NSAEBB/NSAEBB260/index.htm
A newly declassified internal history of the National Security Agency during the Cold War years which discloses Soviet actions related to the Cuban Missile Crisis. Made available in parts, although some material has been withheld. Posted by the National Security Archive at George Washington University
