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