Helton, Floyd Franklin,    1912- <br/><br/>
Analytic trigonometry    
Floyd F. Helton. 
 - Philadelphia,   Saunders,   1972. 
 - vii, 297 p.    ill.    25 cm. 
<br/><br/><label>ISBN: </label>0721646328 
<br/><br/><label>LCCN: </label>78-180181 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plane trigonometry.--------
<br/><br/><label>Dewey Class. No.: </label>516.24