Gardner, Martin       frey50        <br/><br/>
Codes, ciphers and secret writing.  Print 
Martin Gardner 
 - New York  Simon & Schuster  1972 
 - pg. 96  Includes illustrations and graphs 
<br/><br/> Includes reference 
<br/><br/> Learning how to write and read secret code writing.  
<br/><br/><label>ISBN: </label>67165201X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ciphers<br/>Secret writing<br/>decoding <br/>writing
<br/><br/><label>Dewey Class. No.: </label>j652 Gar   26