Gaines, Helen Fouche <br/><br/>
Cryptanalysis: A study of ciphers and their solution 
Helen Fouche Gaines 
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 - Dover Publcations, New York  1956 
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 - .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Number theory-- Algebra-- Mathematics
<br/><br/><label>Dewey Class. No.: </label>512.7  GAI-C