Ratcliff, R. A.  1963- <br/><br/>
Delusions of intelligence :  Enigma, Ultra and the end of secure ciphers / 
R. A. Ratcliff. 
 - Cambridge ;  New York :  Cambridge University Press,  2006 
 - xvii, 314 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>9780521736626 9780521855228 (hbk.) 0521855225 (hbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Enigma cipher system.<br/>ULTRA (Intelligence system)<br/>World War, 1939-1945--Cryptography.<br/>World War, 1939-1945--Electronic intelligence--Great Britain<br/>World War, 1939-1945--Electronic intelligence--Germany.
<br/><br/><label>LC Class. No.: </label>D 810  / R233d 2006 
<br/><br/><label>Dewey Class. No.: </label>940.54/8743