TY  - BOOK
AU  - Kahn,David
TI  - Seizing the enigma: the race to break the German U-boat codes, 1939-1943 
SN  - 0395427398 :
AV  - D810.C88 K34 1991
U1  - 940.54/85 20
PY  - 1991///
CY  - Boston
PB  - Houghton Mifflin Co.
KW  - World War, 1939-1945
KW  - Cryptography
KW  - Naval operations, German
KW  - Naval operations
KW  - Submarine
KW  - World War, 1939-1945 -- Naval operations -- Submarine
N1  - "A Thomas Congdon book"--T.p. verso; Includes bibliographical references (p. [311]-326) and index
ER  -