TY  - BOOK
AU  - Kimpton,Diana
TI  - Cracking Codes
T2  - The knowledge
SN  - 0439981840 (pbk.) :
PY  - 2003///
CY  - London
PB  - Hippo
KW  - Ciphers
KW  - Juvenile literature
KW  - Cryptography
N1  - Formerly CIP
ER  -