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Loads of Codes and Secret Ciphers
Janeczko
Hardcover (Simon & Schuster Children's Publishing, Oct. 1, 1984)Discusses and provides practice in making and breaking codes and ciphers, as well as in building simple coding devices to transmit secret messages.
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Loads of Codes and Secret Ciphers
Paul B. Janeczko
Paperback (CARNIVAL, March 27, 1986)None
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Loads/codes/secret Cypher
Paul B. Janeczko
Hardcover (HarperCollins Publishers, March 27, 1986)None