Haldane, Robert A. <br/><br/>
The hidden war / 
R.A. Haldane. 
 - New York :  St. Martin's Press,  1978. 
 - 224 pages, 4 unnumbered leaves of plates :  illustrations ;  23 cm 
<br/><br/>Includes bibliographical references (pages 198-202) and index. 
<br/><br/><label>ISBN: </label>0312371977 9780312371975 0709164866 9780709164869 
<br/><br/><label>LCCN: </label>77012279  
<br/><br/><label>Nat. Bib. No.: </label>GB7815301  bnb 
<br/><br/><label>Nat. Bib. Agency Control No.: </label>070-91648  Uk 
<br/><br/><label>Subjects--Chronological Terms: </label><br/>1939-1945 
<br/><br/><label>Subjects--Topical Terms: </label><br/>World War, 1939-1945--Cryptography.<br/>World War, 1939-1945--Secret service.<br/>Guerre mondiale, 1939-1945--Cryptographie.<br/>Guerre mondiale, 1939-1945--Service secret.<br/>Cryptography.<br/>Secret service.
<br/><br/><label>Subjects--Index Terms: </label>World War 2  Military cryptology 
<br/><br/><label>LC Class. No.: </label>D810.C88  / H11