TY  - BOOK
AU  - Humble,Richard
TI  - U-boat
SN  - 0531140237
AV  - D781 .H86 1990
U1  - 940.54/51 20
PY  - 1990///
CY  - New York
PB  - F. Watts
KW  - World War, 1939-1945
KW  - Naval operations
KW  - Submarine
KW  - Juvenile literature
KW  - Naval operations, German
KW  - Campaigns
KW  - Atlantic Ocean
KW  - Submarine boats
N2  - A brief history of German submarine warfare during World War II and the measures taken by the Allies to combat the U-boats
ER  -