TY  - BOOK
AU  - Mason,David
TI  - U-boat: the secret menace
T2  - Ballantine's illustrated history of World War II. Weapons book,  
PY  - 1968///
CY  - New York
PB  - Ballantine Books
KW  - World War, 1939-1945
KW  - Naval operations
KW  - Submarine
KW  - Campaigns
KW  - Atlantic Ocean
KW  - Naval operations, German
N1  - Bibliography: p. 160
ER  -