Lewin, Ronald <br/><br/>
The American magic :  codes, ciphers and the defeat of Japan / 
Ronald Lewin. 
 - New York :  Farrar Straus Giroux,  c1982. 
 - xv, 332 p. : ill. maps 
<br/><br/> Includes appendices, bibliography and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>World war, 1939-1945--Cryptography<br/>World War, 1939-1945--Secret service--United States<br/>World War, 1939-1945--Japan<br/>Japan--History--1912-1945