Maxfield, John E. <br/><br/>
Discovering number theory 
[by] John E. Maxfield and Margaret W. Maxfield. 
 - Philadelphia  Saunders  1972. 
 - ix, 129 p.  illus.  24 cm. 
<br/><br/> 920327 
<br/><br/><label>ISBN: </label>0721661866 
<br/><br/><label>LCCN: </label>70165282 //r86 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Numbers, Theory of.
<br/><br/><label>LC Class. No.: </label>QA241  / .M42 
<br/><br/><label>Dewey Class. No.: </label>512/.7