Editore: Dover Publications, 1955
Da: BookDepart, Shepherdstown, WV, U.S.A.
Paperback. Condizione: UsedGood. Softcover; history and modern use of codes and ciphers, together with 151 problems and their solutions; Dover reprint of 1943 copyright; fading and shelf wear to exterior; otherwise in good condition with clean text, tight binding.