Sam <br/><br/>
The First Book of Codes and Ciphers 

 - United States:  Franklin Watts,Inc.,  1956. 
 - 59p.;  ill.  22cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Processes of written communication
<br/><br/><label>Dewey Class. No.: </label>652.8  / SAM