Codes, Ciphers and Spies: Tales of Military Intelligence in World War I - Paperback
The Gambler and the Scholars: Herbert Yardley, William & Elizebeth Friedman, and the Birth of Modern American Cryptology - Hardcover
A Brief History of Cryptology and Cryptographic Algorithms - Paperback
!Ah y Le Lo Lay, Le Lo Ley! Musica Tipica de Puerto Rico - Paperback
!Búscalo! (Look It Up!): A Quick Reference Guide to Spanish Grammar and Usage - Hardcover
!Búscalo! (Look It Up!): A Quick Reference Guide to Spanish Grammar and Usage - Paperback
!Eureka! - Hardcover