Purkayastha, G. <br/><br/>
Environmental studies / 
Gautam Purkayastha 
 - 4th rev. ed. 
 - New Delhi :  Kalyani Publishers,  2019. 
 - 373 p. :  ill. ;  26 cm. 
<br/><br/>Includes bibliographical references and indexes. 
<br/><br/><label>ISBN: </label>9789388778398 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental studies
<br/><br/><label>Dewey Class. No.: </label>352.6  / PUR