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
Description: Presents various methods of writing, speaking, and signaling secret messages.