TY  - BOOK
AU  - Winokur,Eric
TI  - Secret codes
T2  - Explorer books
SN  - 0440841542
PY  - 1990///
CY  - New York
PB  - Trumpet Club
KW  - Cryptography
KW  - Ciphers
UR  - http://www.archive.org/details/secretcodes00wino
UR  - http://www.openlibrary.org/books/OL7522987M
ER  -