Environment 

 - Revised edition 
 - Chennai  Shankar IAS academy book publication  2019 
 - 366 p. 
<br/><br/><label>ISBN: </label>9788193422601 
<br/><br/><label>Standard No.: </label>120534 
<br/><br/><label>Subjects--Index Terms: </label>COMPETITION EVS GENERAL 
<br/><br/><label>Dewey Class. No.: </label>363.7076  / ENV