Features
- Cover Type: Hard Cover
- Published by: Dutton Juvenile December 31, 1975
- Written in: English
- ISBN 10 Number: 0525664653
- ISBN 13 Number: 978-0525664659
Card Catalog Description
Examines a number of different ways of writing secret messages, including invisible ink and a variety of ciphers. Gives suggestions and aids for code-breaking.
--This text refers to an out of print or unavailable edition of this title.