TY  - BOOK
AU  - Bennett,Ralph
TI  - Intelligence investigations: how ultra changed history 
SN  - 071464742X
PY  - 1996///
CY  - London
PB  - Frank Cass
KW  - World War, 1939-1945
KW  - Military intelligence
KW  - Cryptography
N1  - Includes index
ER  -