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Top secret : a handbook of codes, ciphers, and secret writing
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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 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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The secret agent training manual : how to make and break top secret messages
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The code book :how to make it, break it, hack it, crack it
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The code book how to make it, break it, hack it, crack it
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Enigma :the battle for the code
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The secret of the skeleton key
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The haunted lighthouse
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The mummy's curse
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The mystery of the pirate's treasure
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Keyboarding made simple
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Typing and keyboarding for everyone: 35 lessons to improve speed and accuracy
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The handwriting of American records for a period of 300 years
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A chain of thunder : a novel of the Siege of Vicksburg
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The emperor's code
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Geniuses at war : Bletchley Park, Colossus, and the dawn of the digital age
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Chef Roy Choi and the street food remix
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The enigma girls : how ten teenagers broke ciphers, kept secrets, and helped win World War II
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The treasure hunt : true stories of treasures lost, stolen, and found
