Codemaster #1
Subtitle: how to write and decode secret messages
Publisher: Scholastic
Published: June 1998
Language: eng
Format: Paperback
ISBN-13: 9780590373869
Subjects: Games & Activities - General; Children: Grades 2-3; Children's 9-12 - Activity Books; Children's Books/Ages 9-12 Nonfiction; Juvenile literature; Activity Books - General; Ciphers; Cryptography