Gaines, Helen Fouche'. <br/><br/>
Cryptanalysis :   a study of ciphers and their solution/ 
Helen Fouche' Gaines. 
 - New York :   Dover Publications, Inc.,   c1956. 
 - vi, 237p. :ill. ; 20cm. 
<br/><br/> Includes appendices. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cryptography.<br/>Ciphers.
<br/><br/><label>LC Class. No.: </label>57203 
<br/><br/><label>Dewey Class. No.: </label>652.8  / G142