Das, B. C. , <br/><br/>
Higher  Trigonometry 

 - 25th. 
 - Calcutta:  U. N. Dhur  &  Sons  Private  Limited. 
 - 288p. 
<br/><br/><label>Subjects--Personal Names: </label><br/>Mathematics., Trigonometry. 
<br/><br/><label>Dewey Class. No.: </label>516.24