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Author Beal, George, active 1968-
Title Find out about secret codes and messages / George Beal ; illustrated by Jenny Thorne and Oxford Illustrators Ltd.
Pub Info London : Treasure Press, 1990.
book jacket
 Truro-Childrens Coll.  J 652.8 BEA     AVAILABLE
Descript 75 pages : illustrations (some color) ; 28 cm
text txt rdacontent
unmediated n rdamedia
volume nc rdacarrier
Note "First published in 1973 under the title Codes, ciphers and secret writing."--Title page verso.
Includes index.
Summary Describes various types of codes and ciphers giving examples of their use.
Subject Cryptography -- Juvenile literature.
Ciphers -- Juvenile literature.
Add Title Codes, ciphers and secret writing
ISBN 1850516057
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