Campbell, Howard E. <br/><br/>
Concepts of trigonometry / 
Howard E. Campbell 
 - Boston :   Prindle, Weber & Schmidt,   ©1981. 
 - Various Pagins  :  ill. ;  25 cm 
<br/><br/><label>ISBN: </label>0871502992 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry<br/>Algebra
<br/><br/><label>Dewey Class. No.: </label>512.13  / CAC 1981