Children love to learn secret codes and write encrypted messages and this book will teach them everything they need to know, including Semaphore and Morse code, "Grid code" used in the American Civil War, Egyptian hieroglyphics and traditional number replacement and alphabet switching codes.

Binding: Paperback;112 pages; Publisher: Usborne Publishing Ltd; Classification: Children?s / Teenage: General interest; Weight: 248 g; Dimensions: 198 x 132 x 9

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