Teachers and Code-Breakers: The Latin Genesis Tradition, 430-800
Secret Warriors: The Spies, Scientists and Code Breakers of World War I
Australian Code Breakers
Code Breakers: Riveting Reads for Curious Kids (Mega Bites)
Teachers and code-breakers: the latin Genesis tradition, 430-800
The secret war : the inside story of the code makers and code breakers of World War II