Cover art for Over 50 Secret Codes
Published
Usborne, March 2015
ISBN
9781409584612
Format
Softcover, 112 pages
Dimensions
19.7cm × 13.3cm × 0.9cm

Over 50 Secret Codes by

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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.

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