TY  - BOOK
AU  - Winterbotham,F.W.
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, F. W.
KW  - World War, 1939-1945
KW  - Cryptography
KW  - Secret service
KW  - Great Britain
KW  - Personal narratives, British
ER  -