L. M. Kells. <br/><br/>
Plane and spherical trigonometry / 
Kells, L. M.  
 - 2nd ed. 
 - New York :  McGraw-Hill,  c1940. 
 - 401p. :  ill. ; 
<br/><br/>
<br/><br/><br/>english 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry.
<br/><br/><label>Dewey Class. No.: </label>514/KEP