Top secret!
Subtitle: codes to crack
By: Burton Albert, Jr. ; illustrated by Jerry Warshaw.
Contributors: Warshaw, Jerry, ill.
Publisher: A. Whitman
Published: 1987
Place of publication: Niles, Ill
Language: eng
Number of pages: 32
Subjects: Ciphers -- Juvenile literature; Ciphers
Description: An illustrated explanation of twenty-eight secret codes that can be used to send messages.