The Usborne Book of Secret Codes features al l kinds of codes and secret writing to learn, gadgets that y oung readers can make for coding and decoding messages and h ints on how to pass top secret information without it being intercepted '

The Usborne Book of Secret Codes 1997, E.D.C. Publishing

ISBN-13: 9780746023297

Trade paperback

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The Usborne Book of Secret Codes 1997, E.D.C. Publishing

ISBN-13: 9780881109795

Hardcover

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Usborne Book of Secret Codes 1997, Usborne Publishing Ltd, London

ISBN-13: 9780746023303

Hardcover

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