Gaines, Helen Fouché <br/><br/>
Cryptanalysis : a study of ciphers and their solution 
Helen Fouché Gaines 
 - New York  Dover Publications  1956 
 - vi-237 p. : ill 
<br/><br/><label>ISBN: </label>9780486200972 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cryptography
<br/><br/><label>Dewey Class. No.: </label>793 GAI