Secrets with ciphers and codes
By: by Joel Rothman and Ruthven Tremain.
Contributors: Tremain, Ruthven, illus.
Publisher: Macmillan
Published: 1969
Place of publication: [New York]
Language: eng
Number of pages: 32
Subjects: Ciphers -- Juvenile literature.; Ciphers.
Description: Introduces ten encoding methods using numbers, rearranged letters, colored squares and dots, and other systems. Provides a message to decipher with each method.