Incoming Resources
- Tower of secrets, a real life spy thriller, Victor Sheymov
- Top secret, a handbook of codes, ciphers, and secret writing, Paul B. Janeczko ; illustrated by Jenna LaReau
- Secret languages, communicating in codes and ciphers, Julian A. Bielewicz. --
- The book of codes, understanding the world of hidden messages : an illustrated guide to signs, symbols, ciphers, and secret languages, Paul Lunde, general editor
- Secret writing--codes and messages, by Eugene Baker ; illustrated by Lois Axeman. --
- Codes, ciphers, and secret writing. -