Codes & mystery messages
By: Cameron and Margaret Yerian, editors
Contributors: Yerian, Margaret, joint author
Series: Fun time activities books
Publisher: Childrens Press
Published: 1975
Place of publication: Chicago
Language: eng
Number of pages: 46
ISBN-13: 9780516013169
Subjects: 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.