TY  - BOOK
T1  - Codes and ciphers
A1  - Wrixon, Fred B.
LA  - English
PP  - New York
PB  - Prentice Hall
YR  - 1992
UL  - http://discoverylib.upm.edu.my/discovery/Record/447434
OP  - 260
CN  - Z103.3 W956
SN  - 0132770474
KW  - Cryptography : Juvenile literature.
KW  - Ciphers : Juvenile literature.
KW  - Cryptography : Dictionaries.
KW  - Ciphers : Dictionaries.
ER  -