Secrets, signs, signals & codes /

Discusses codes, silent signals, invisible writing, and other ways to conceal messages.

Bibliographic Details

Main Author:	Lewis, Shari
Other Authors:	McCarthy, Helen
Format:	Book
Language:	English
Published:	New York : Holt, Rinehart and Winston, [1980]
Series:	Kids-only-club.
Subjects:	Ciphers > Juvenile literature. Cryptography > Juvenile literature. Writing, Invisible > Juvenile literature. Signs and symbols > Juvenile literature. Ciphers. Cryptography. Signs and symbols.