00636cam a2200205 4500 62117632 TxAuBib 20010730120000.0 010730s1964||||||||||||||||||||||||eng|u 64013723 MKN UKM TxAuBib Laffin, John. Codes and ciphers : secret writing through the ages / by John Laffin ; illustrated by C. de la Nougerede. New York : Abelard-Schuman, 1964. 152 p. : ill. ; 21 cm. Includes index. 20010730. Ciphers. Cryptography.