TY  - BOOK
AU  - Kahn,David
TI  - The codebreakers: the story of secret writing 
SN  - 0684831309
U1  - 652 Abridged edition 15
PY  - 1996///]
CY  - New York
PB  - Scribner
KW  - Cryptography
KW  - History
N1  - "Revised and Updated"--Cover
ER  -