TY  - BOOK
AU  - Kahn, David,
TI  - Codebreakers : the story of secret writing 
SN  - 9780684831305
U1  - 652.8 KAH 
PY  - 1996///
CY  - New York
PB  -  Scribner
KW  - Processes of \yritten communication
KW  - Cryptography history
ER  -