Environment  Textual Documents 
Shanakar IAS Academy Book Publications 
 - 7th. Rev. Ed. 
 - Tamil Nadu:  Shanakar IAS Academy Book Publications,  2019. 
 - 365p.:  24cm. 
<br/><br/><label>ISBN: </label>9788193422601 
<br/><br/><label>Subjects--Index Terms: </label>Environment 
<br/><br/><label>Dewey Class. No.: </label>301.31