Secret writing tricks
By: by Geoffrey Lamb.
Edition: 1st ed.
Publisher: T. Nelson
Published: 1975
Place of publication: Nashville
Language: eng
Number of pages: 88
Subjects: Cryptography -- Juvenile literature.; Ciphers.; Cryptography.
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.