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