The spy's guide to secret codes and ciphers
By: by Jim Wiese with H. Keith Melton.
Contributors: Melton, H. Keith 1944-
Publisher: Scholastic
Published: 2002
Place of publication: New York
Language: eng
Number of pages: 48
Subjects: Cryptography -- Juvenile literature.; Ciphers -- Juvenile literature.
Notes: "Spy university."