Purkayastha, Gautam <br/><br/>
Environmental Studies  Book 
Purkayastha. 
 - New Delhi :  Kalyani Publishers,  0 
 - , 150 p. : 
<br/><br/> All. 
<br/><br/><br/>English 
<br/><br/><label>ISBN: </label>9789327239799 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental Science-
<br/><br/><label>Dewey Class. No.: </label>304.2