Elementary number theory 
Dudley, Underwood. 
 -  W. H. Freeman,  1969 
 - ix, 262 p. 
 - A Series of books in mathematics .
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<br/><br/><label>ISBN: </label>0-7167-0438-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Number theory.
<br/><br/><label>Dewey Class. No.: </label>510 D86e 1969