Das, B. . <br/><br/>
Elementary Trigonometry /  Textual Documents 
B.Das. 
 - 1st ed. / 
 - Calcutta :  S.K.Palit & Co. ,  1945. 
 - 242p. ;  21cm. 
<br/><br/><label>Subjects--Index Terms: </label>Trigonometry G-Mathematics 
<br/><br/><label>Dewey Class. No.: </label>514  / D 26 El