How to keep a secret
Subtitle: writing and talking in code
By: Elizabeth James & Carol Barkin ; ill. by Joel Schick.
Contributors: Barkin, Carol, joint author.; Schick, Joel.
Edition: 1st ed.
Publisher: Lothrop, Lee & Shepard
Published: 1978
Place of publication: New York
Language: eng
Number of pages: 56
Subjects: Ciphers -- Juvenile literature; Cryptography -- Juvenile literature; Ciphers; Cryptography
Description: Presents various methods of writing, speaking, and signaling secret messages.