Explore the fascinating world of secret codes and ciphers with this vintage book by Bernice Kohn. Published in 1968 by Prentice Hall, this first edition paperback is a must-have for young adults and adults alike who are interested in learning about the strategies and techniques used by the National Security Agency (NSA).

Featuring 60 pages of nonfiction narrative, this book provides an in-depth look at ciphers and codes, covering topics such as their history, development, and applications. Frank Aloise's illustrations add to the book's vintage charm, making it a unique addition to any collection. Don't miss out on the opportunity to own this classic piece of literature today!