Presents various methods of writing, speaking, and signaling secret messages.
- ISBN10 0688162770
- ISBN13 9780688162771
- Publish Date 17 October 1998 (first published 10 August 1986)
- Publish Status Active
- Publish Country US
- Imprint HarperCollins Publishers
- Edition REV BEECH TREE ed.
- Format Hardcover
- Pages 64
- Language English