Environmental studies:  for undergraduate classes. 
DR.J.P.SHARMA 
 - 4th 
 - New Delhi,india.  University Science Press  c2017 
 - vii,316p;  illus. 
<br/><br/><label>ISBN: </label>9789386035486 
<br/><br/><label>LC Class. No.: </label>G2857 S52 2017