Codes & mystery messages
By: Cameron and Margaret Yerian, editors.
Contributors: Yerian, Margaret, joint author.
Publisher: Childrens Press
Published: 1975
Place of publication: Chicago
Language: eng
Number of pages: 46
Subjects: Cryptography -- Juvenile literature.; Signs and symbols -- Juvenile literature.; Signals and signaling -- Juvenile literature.; Cryptography.; Signs and symbols.
Description: Explains how to create various kinds of codes and discusses other means of sending messages, such as Indian sign language, brands, and flag signals.
Notes: "Fun time."
Includes index.