Mollin, Richard A. <br/><br/>
Codes  : the guide to secrecy from ancient to modern times / 

 - Boca Raton:  Chapman & Hall/CRC Press,  2005 
 - xx, 679p. Bibl. Index. 
 - Discrete Mathematics and its applications .
<br/><br/> "Purchased under NBHM grant for the year 2005-2006" 
<br/><br/><label>ISBN: </label>1584884703 
<br/><br/><label>Dewey Class. No.: </label>518.11  / M726.C