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The code book how to make it, break it, hack it, crack it
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Top secret : a handbook of codes, ciphers, and secret writing
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Can you crack the code?
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The Way Things Work: Telecommunications
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The idea factory : Bell Labs and the great age of American innovation
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Hedy and her amazing invention
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Pass it on! : all about notes, from secret codes and special inks to fancy folds and dead man's drops
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Mysterious messages : a history of codes and ciphers
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Secret messages : concealment, codes, and other types of ingenious communication
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The secret agent training manual : how to make and break top secret messages
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The woman who smashed codes : a true story of love, spies, and the unlikely heroine who outwitted America's enemies
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The woman who smashed codes a true story of love, spies, and the unlikely heroine who outwitted America's enemies
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The woman who smashed codes a true story of love, spies, and the unlikely heroine who outwitted America's enemies
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Morse code
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In code :a mathematical journey
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Written by hand : techniques and tips to make your everyday handwriting more beautiful
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Beginner's step-by-step coding course : learn computer programming the easy way
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Typing and keyboarding for everyone: 35 lessons to improve speed and accuracy
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Keyboarding made simple
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Mastering computer typing
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The handwriting of American records for a period of 300 years
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Samuel Morse, that's who! : the story of the telegraph and Morse code
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Secret codes and hidden messages
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National electrical code 2014
