TY  - BOOK
AU  - Wrixon,Fred B.
TI  - Codes and ciphers
SN  - 0132770474 :
U1  - 652.8 WRI 22nd ed.
PY  - 1992///
CY  - New York
PB  - Prentice Hall
KW  - Cryptography
KW  - Juvenile literature
KW  - Ciphers
KW  - Dictionaries
N1  - Includes bibliography and index
N2  - An alphabetical exploration of the world of codes and ciphers and significant individuals involved in that field
ER  -