Kells, Lyman M. <br/><br/>
Plane and spherical trigonometry / 
Lyman M. Kells, James R. Bland. 
 - 3rd edition. 
 - New York :  McGraw-Hill Book Company, Incorporated,  c1978. 
 - ix, 290 pages :  Illustration ;  22 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry.