Deswal, Surinder. <br/><br/>
A Basic Course in Environmental Studies / 
By Surinder Deswal, Anupama Deswal. 
 - 1st Ed. 
 - Delhi :  Dhanpat Rai & Co,  2004. 
 - 7.36p. ;  00 cm. 
<br/><br/><label>Dewey Class. No.: </label>363.7  / DES