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Codes - how to make them and break them

Codes - how to make them and break them

Poskitt, Kjartan; Baker, Ian

Book. English.
Published London: Scholastic, 2007
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Statement of responsibility: Kjartan Poskitt ; illustrated by Ian Baker
ISBN: 0439943280, 9780439943284
Physical Description: 1 Paperback : ill. ; 20 cm.
Series: Murderous maths
Subject: Cryptography Juvenile literature.; Ciphers Juvenile literature.