Deswal S. & Deswal A. <br/><br/>
A Basic Course in Environmental Studies  Textual Documents  
Deswal S. & Deswal A. 
 - 2nd Ed. 
 -  Dhanpat Rai Publications  2012 
 - 255 
<br/><br/><label>ISBN: </label>NIL   
<br/><br/><label>Dewey Class. No.: </label>333.707