Mason, David,  1938- <br/><br/>
U-boat: the secret menace / 
David Mason.    
 - New York :  Ballantine Books,  1968. 
 - 160 pages :  ill., maps, plans, ports. ;  21 cm. 
 - Ballantine's illustrated history of World War II. Weapons book,    no. 1 .
 - 355.49(~)"1939-45":623.827(09) (NLA) .
<br/><br/>Bibliography: p. 160 
<br/><br/><label>Subjects--Topical Terms: </label><br/>World War, 1939-1945--Naval operations--Submarine<br/>World War, 1939-1945--Campaigns--Atlantic Ocean<br/>World War, 1939-1945--Naval operations, German
<br/><br/><label>Universal Decimal Class. No.: </label>355.49(~)"1939-45":623.827(09) (NLA)