Helton, Floyd Franklin <br/><br/>
Analytic trigonometry 
[by] Floyd F. Helton. 
 - Philadelphia  Saunders  1972. 
 - vii, 297 p.  illus.  26 cm. 
<br/><br/><label>ISBN: </label>0721646328 
<br/><br/><label>LCCN: </label>78180181  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry, Plane.
<br/><br/><label>LC Class. No.: </label>QA533  / .H475 
<br/><br/><label>Dewey Class. No.: </label>516/.34