TY  - BOOK
T1  - U-boat :the secret menace.
DA  - 1968
CY  - New York :
AU  - Mason, David,
CN  - D781
CN  - D781
PB  - Ballantine Books,
PP  - New York :
PY  - 1968
ID  - 253292
KW  - World War, 1939-1945
KW  - World War, 1939-1945
KW  - World War, 1939-1945
SN  - 0345249887250 (pbk.)
TI  - U-boat :the secret menace.
ER  -