Das,B.C. <br/><br/>
Intermediate Trigonometry 
by B.C. Das 
 - 32nd Ed.   Rep. 
 - Calcutta:  U.N. Dhur & Sons Pvt Ltd.,  1933. 
 - 282p.:  15cm. 
<br/><br/><label>Subjects--Index Terms: </label>Topology 
<br/><br/><label>Dewey Class. No.: </label>514