Plane and spherical trigonometry 
Kells, Lyman M. (Lyman Morse), 1888- 
 - Third edition. 
 -  McGraw-Hill,  1978 
 - 290 pages 
<br/><br/>
<br/><br/><label>ISBN: </label>9-71081917-8 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plane trigonometry.
<br/><br/><label>Dewey Class. No.: </label>516.24 K29p 1978