The battle of the Atlantic and signals intelligence :  U-boat situations and trends, 1941-1945 / 
edited by David Syrett 
 - Aldershot :  Ashgate,  1998 
 - xxxix, 628 p. :  ill. ;  23 cm. 
 - Publications of the Navy Records Society ;  vol. 139 .
<br/><br/><label>ISBN: </label>1840142952  RM483.70 
<br/><br/><label>Subjects--Topical Terms: </label><br/>World War, 1939-1945--Cryptography<br/>World War, 1939-1945--Military intelligence<br/>World War, 1939-1945--Naval operations--Submarine<br/>World War, 1939-1945--Naval operations, German<br/>World War, 1939-1945--Campaigns--Atlantic Ocean