Natural environment:Issues and challenges/ 

 - New Delh:  Anmol Publications Pvt Ltd.,  2001. 
 - 264 p, ;  ill , ; 
<br/><br/>Encyclopedia of environmental pollution and awareness in 21st century series 
<br/><br/><label>ISBN: </label>8126109173 
<br/><br/><label>Dewey Class. No.: </label>333.7  / PRA P0IN