Kahn, David, <br/><br/>
The codebreakers / 
David Kahn. 
 - [Abridged] ed. 
 - London :  Weidenfeld and Nicolson,  1974. 
 - xvi, 576 p., [8] p. of plates :  ill., facsims., ports. ;  23 cm. 
<br/><br/>The Pagent of Cryptology (Page-71), Paracryptology (Page-895), The New Cryptology (Page-969). 
<br/><br/><label>ISBN: </label>0297767852 : 
<br/><br/><label>LCCN: </label>75323867 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cryptography--History.
<br/><br/><label>Dewey Class. No.: </label>005.8,KAH