Kohnen, David <br/><br/>
Commanders winn and knowles :  winnig the U-Boat war with intelligence, 1939-1943 / 
David Kohnen. 
 - Kraków :  Enigma Press,  1999. 
 - 168 s. ;  21 cm. 
<br/><br/> History 
<br/><br/><label>ISBN: </label>8386110341 
<br/><br/><label>Subjects--Index Terms: </label>World War, 1939-1945