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English
Norway
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About the book
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.
Book details
ISBN
9781409584612
Publisher
Usborne Publishing Ltd
Published year
2015
Language
Edition
1
Original title
50 Secret Codes
Format
Paperback
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