Discusses codes, maps, hidden messages, signals, disguises, and other secretive activities.
- ISBN10 0806980400
- ISBN13 9780806980409
- Publish Date 1 January 1976
- Publish Status Out of Stock
- Out of Print 3 October 2008
- Publish Country US
- Imprint Sterling Publishing (NY)
- Edition Illustrated edition
- Format Hardcover
- Pages 47
- Language English