Kozaczuk, Władysław. <br/><br/>
Enigma :  how the Poles broke the Nazi code / 
Władysław Kozaczuk & Jerzy Straszak. 
 - New York :  Hippocrene Books,  c2004. 
 - viii, 163 p. :  ill. ;  23 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>078180941X 
<br/><br/><label>LCCN: </label>2004040636 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Enigma cipher system.<br/>ULTRA (Intelligence system)<br/>World War, 1939-1945--Electronic intelligence--Poland.<br/>World War, 1939-1945--Electronic intelligence--Great Britain.<br/>World War, 1939-1945--Cryptography.<br/>Cryptography--History--Poland--20th century.
<br/><br/><label>LC Class. No.: </label>D810.C88  / K67 2004 
<br/><br/><label>Dewey Class. No.: </label>940.54/8641