Secret messages, how to read and write them
Publisher: A.A. Knopf
Published: 1929
Place of publication: New York
Language: eng
Number of pages: 137
Subjects: Ciphers; Juvenile literature; Cryptography
Notes: Second printing. Galland, p. 180.

Bound in cranberry cloth; stamped in yellow.

Library of the American Cryptogram Association (George C. Lamb Collection).