This practical field guide contains everything a young person needs to know about the art of concealment: making and breaking codes, mastering cipher systems, experimenting with secret writing, and making--and breaking--their own secret codes. Illustrations.
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ISBN | 9780763629724 |
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Sprache | eng |
Cover | Kartonierter Einband (Kt) |
Verlag | Candlewick Books |
Jahr | 200604 |
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