Zim, Herbert S. (Herbert Spencer) 1909-1994 creator text nyu New York Scholastic Book Services c1948, 1975 printing 1948 Abridged ed. monographic eng

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115 p. : ill. ; 20 cm. juvenile by Herbert S. Zim. Cryptography Z104 .Z5 1965 652.8 ZIM 0590025058 9780590025058 http://www.archive.org/details/codessecretwriti00zimh http://www.openlibrary.org/books/OL24203635M http://www.archive.org/details/codessecretwriti00zimh http://www.openlibrary.org/books/OL24203635M ILC 800924 20230525155154.0 codessecretwriti00zimh