Environment / 
Shankar IAS Academy 
 - 9th ed. 
 - Chennai :  Shankar IAS Academy Book Publications,  2021. 
 - 448 p. :  pbk ;   22 cm 
<br/><br/><label>ISBN: </label>9788193422601 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology.<br/>Ecosystem.
<br/><br/><label>Dewey Class. No.: </label>363.7   / ENV