Baker, Eugene.
Secret writing--codes and messages / by Eugene Baker ; illustrated by Lois Axeman. - Elgin, Ill. : Child's World, 1980. - 32 p. : ill. - The Junior detective series .
Discusses a variety of codes and explains how to send and decode messages.
0895651505 : $5.50
80011416
Cryptography.
Ciphers.
001.54
Secret writing--codes and messages / by Eugene Baker ; illustrated by Lois Axeman. - Elgin, Ill. : Child's World, 1980. - 32 p. : ill. - The Junior detective series .
Discusses a variety of codes and explains how to send and decode messages.
0895651505 : $5.50
80011416
Cryptography.
Ciphers.
001.54