TY  - BOOK
AU  - Winterbotham,F.W.
TI  - The ultra secret
SN  - 0297768328 :
U1  - 940.548 
PY  - 1975///
CY  - London
PB  - Weidenfeld And Nicolson
KW  - Winterbotham, F. W.
KW  - World War, 1939-1945
KW  - Cryptography
KW  - Secret service
KW  - Great Britain
KW  - Personal narratives, British
N1  - Includes index
ER  -