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Secret and urgent : the story of codes and ciphers /

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Bibliographic Details
Main Author: Pratt, Fletcher, 1897-1956
Corporate Author: American Cryptogram Association
Format: Book
Language:English
Published: Garden City, N.Y. : Blue Ribbon Books, 1942
Subjects:
Ciphers.
Cryptography.
Description
Item Description:"Blue ribbon books."
Physical Description:282 pages : illustrations ; 21 cm.
Bibliography:Includes bibliographical references and index.