TY  - BOOK
AU  - Winterbotham,Frederick William
TI  - The Ultra secret
SN  - 0060146788
AV  - D810.C88 W56 1974
U1  - 940.54/86/41 
PY  - 1974///
CY  - New York
PB  - Harper & Row
KW  - Winterbotham, Frederick William.
KW  - World War
KW  - Cryptography
KW  - Local
KW  - Personal narratives, British
KW  - Secret service
KW  - Great Britain
ER  -