| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Cryptograms | 978-0-89412-043-5 (0-89412-043-3) | 2008 | |
| History of Codes and Ciphers in the U.S. During the Period Between World Wars: 1919-1929 | 978-0-89412-039-8 (0-89412-039-5) | 1979 | United States Army Security Agency Historical Section |