Kahn, David,  1930- <br/><br/>
The codebreakers;  the story of secret writing. 
 Story of secret writing 

 - New York,  Macmillan  [1967] 
 - xvi, 1164 p.  illus., facsims., ports.  24 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cryptography--History.<br/>Cryptographers.
<br/><br/><label>LC Class. No.: </label>Z103  / .K28 
<br/><br/><label>Dewey Class. No.: </label>652.8