Sharp [lester W],  <br/><br/>
Fundementals Of Cyptology 

 - New York  Mc Graw Hill  1943 
<br/><br/><label>Subjects--Uniform Titles: </label>--General Stack
<br/><br/><label>Subjects--Topical Terms: </label><br/>Life sciences--Generalia--Biology
<br/><br/><label>Dewey Class. No.: </label>576.31  / SHA-F