Codemaster #1
Subtitle: how to write and decode secret messages
By: by Marvin Miller.
Publisher: Scholastic
Published: 1998
Place of publication: New York
Number of pages: 69
ISBN-13: 9780590373869
Subjects: Cryptography -- Juvenile literature.; Ciphers -- Juvenile literature.
Genres: Juvenile literature.
Description: Learn the Pinhole code,the Inside-out code, the Mixed-up math code, the Pigpen code, and more.