The Kids' Code and Cipher BookBook - 1991
Presents a variety of codes and ciphers and includes messages to encode and decode, as part of a story.
Publisher: Hamden, Conn. : Linnet Books, 1991, c1981
Call Number: j652 Ga 1991
Characteristics: xi, 163 p. : ill. ; 23 cm
Alternative Title: Kids' code & cipher book