Kells, Lyman M., Willis F. Kern, James R. Bland, Lyman M. Kells, Willis F. Kern, James R. Blan <br/><br/>
Plane and spherical trigonometry 

 - 3rd Edition 
 -   McGraw-Hill Book Company , Inc.  1978 
 - 290 
<br/><br/><label>Dewey Class. No.: </label>516. 24 K29