TY  - BOOK
AU  - Bielewicz, Julian A.
TI  - Secret languages: communicating in codes and ciphers
SN  - 0525666516
PY  - 1976///
CY  - New York
PB  - Elsevier/Nelson Books
KW  - Cryptography
KW  - Juvenile literature
KW  - Ciphers
ER  -