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(Paperback)
By: Emily Bone
ISBN: 9781409584612
Readership/Audience: Children
Publication Date: Apr 2015
UK Publication Date: 1st March 2015
Publisher: Usborne Publishing Ltd
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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.
