Presents a variety of codes and ciphers and includes messages to encode and decode, nearly all of which are part of a story.
- ISBN10 0030538564
- ISBN13 9780030538568
- Publish Date 1 January 1981
- Publish Status Out of Print
- Out of Print 10 May 2014
- Publish Country US
- Imprint Holt McDougal
- Format Hardcover
- Pages 163
- Language English