Gaines, Helen Fouch�,  Mrs. [from old catalog] <br/><br/>
Elementary cryptanalysis;  

 - Boston,  American photographic publishing co.,  1939. 
 - vi p., 1 l.,  230 p. diagrs.  24 cm. 
<br/><br/><label>LCCN: </label>39031782  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ciphers. [from old catalog]<br/>Cryptography. [from old catalog]
<br/><br/><label>LC Class. No.: </label>Z 104  / G34 1942