Editore: New Era Studios, 1961
Da: Pistil Books Online, IOBA, Seattle, WA, U.S.A.
Membro dell'associazione: IOBA
Staple Bound. Condizione: Fine. 10 page booklet with crenelated hard paper covers containing a code through which one can "correspond with anyone, anywhere, regardless of differences in our languages by writing your message in numbers. Keywords: Codes, Secret Codes, Code Breaking, Decryption, Cryptography, Cryptology, Encryption, Encipherment, Cryptanalysis, Encoding.