Deswal, S. , <br/><br/>
A  Basic  Course  in  Environmental  Studies 

 - 1st /   2008-2009. 
 - Delhi:  Dhanpat  Rai  &  Company  Pvt. Ltd,  2008 2009. 
 - 493p. 
<br/><br/><label>Subjects--Personal Names: </label><br/>  Chemistry.,  Environmental  Studies. 
<br/><br/><label>Dewey Class. No.: </label>333.707