Zim, Herbert S.      <br/><br/>
Codes and secret writing  Print 
Herbert S. Zim 
 - New York  William Morrow & Co.  1948 
 - pg. 154  Includes content 
<br/><br/> Includes Index 
<br/><br/> A book about codes, ciphers, secret writing, and invisible writing.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Codes<br/>Cipher Juvenile literature 
<br/><br/><label>Dewey Class. No.: </label>j652.8 Zim   26