Khan, David <br/><br/>
The Codebreakers :The Comprehensive History of Secret Communication from ancient times 

 - Hemingway  Scribner  1996 
 - 1200 
<br/><br/><label>ISBN: </label>9780684831305 
<br/><br/><label>Subjects--Topical Terms: </label><br/>COMPUTER SCIENCE AND ENGINEERING
<br/><br/><label>Dewey Class. No.: </label>652?.8 KHA/THE