The spy code handbook
By: Duncan Ball & Ian Ball
Contributors: Ball, Ian
Series: Activity bluegum; Activity bluegum
Publisher: Angus & Robertson
Published: 1993
Place of publication: Pymble, N.S.W
Language: eng
Number of pages: 49
ISBN-13: 9780207179662
Subjects: Cryptography; Juvenile literature; Ciphers
Notes: Cover title.

Originally published: 1990.

ANB93/09.

For children.