Incoming Resources
- Secret messages, concealment, codes, and other types of ingenious communication, William S. Butler and L. Douglas Keeney
- America in WWII
- Da Vinci, tracking the code : the facts, the fiction & the phenomenon
- Cracking codes & cryptograms for dummies, by Denise Sutherland [and] by Mark E. Koltko-Rivera ; foreword by Chris Hodapp
- Secret key crytography, ciphers, from simple to unbreakable, Frank Rubin ; foreword by Randall K. Nichols
- Code breaker, spy hunter, how Elizebeth Friedman changed the course of two world wars
- Code breaker, spy hunter, how Elizabeth Friedman changed the course of two world wars
- Code breaker, spy hunter, how Elizebeth Friedman changed the course of two world wars
- Codebreaking, a practical guide, Elonka Dunin & Klaus Schmeh
- Codebreaker, the history of codes and ciphers, from the ancient pharaohs to quantum cryptography, Stephen Pincock