Engelsohn, Harold S. <br/><br/>
Trigonometry :   a complete and concrete approach / 
Harold S. Engelsohn. 
 - New York :  McGraw-Hill,  c 1981. 
 - 470 p. :  ill. ;  24 cm. 
<br/><br/> Includes index. 
<br/><br/>311  311 
<br/><br/><label>ISBN: </label>0-07-019419-X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry.
<br/><br/><label>Dewey Class. No.: </label>514 / E32t