Singh Simon <br/><br/>
Code book    The secret history of codes and codebreaking 
Singh Simon 
 - London  Fourth Estate           1999 
 - xiii,402p.  cm. 
<br/><br/><label>ISBN: </label> INR 499.00 
<br/><br/><label>Standard No.: </label>134111 
<br/><br/><label>Source: </label> 0261, 08/03/2017, Bookwell  Publications  Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Reference
<br/><br/><label>Dewey Class. No.: </label>B2814, N9  LR