TY  - BOOK
AU  - Kohnen,David
TI  - Commanders winn and knowles: winnig the U-Boat war with intelligence, 1939-1943 
SN  - 8386110341
PY  - 1999///
CY  - Kraków
PB  - Enigma Press
KW  - World War, 1939-1945
N1  - History
ER  -