Colossus : the secrets of Bletchley park's codebreaking computers 
edited by B Jack Copeland 
 - Oxford  2010 
 - xvi, 462 p., [16] p. of plates : ill., ports. ; 24 cm 
<br/><br/><label>ISBN: </label>9780199578146 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Great Britain. -- Government Code and Cypher School -- History<br/>Lorenz cipher system<br/>World War, 1939-1945 -- Electronic intelligence -- Great Britain
<br/><br/><label>Dewey Class. No.: </label>940.548641 COP