Description or summary of 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.
Estimated reading time (average reader): 4H49M19S
Other categories, genre or collection: General Knowledge
Available formats: EPUB, TXT, RB, WORD, DOC, PDF, XPS, OEB. Compressed in RZ, AZW4, ZIP, 7Z, ARC, BZ, RAR
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