Codes & secret writing /
Zim, Herbert S. 1909-1994.
Codes & secret writing / [electronic resource] by Herbert S. Zim. - Abridged ed. - New York : Scholastic Book Services, c1948, 1975 printing. - 115 p. : ill. ; 20 cm.
$1.25 0590025058 9780590025058
Cryptography.
Z104 / .Z5 1965
652.8 / ZIM
Codes & secret writing / [electronic resource] by Herbert S. Zim. - Abridged ed. - New York : Scholastic Book Services, c1948, 1975 printing. - 115 p. : ill. ; 20 cm.
$1.25 0590025058 9780590025058
Cryptography.
Z104 / .Z5 1965
652.8 / ZIM