Chhatwal, G. R. <br/><br/>
Encyclopaedia of Environmental Pollution and its Control  
/ by G. R. Chhatwal...[et.al] 
 - new delhi  Anmol Publications 
 - vp. 
<br/><br/> Encyclopaedia of Environmental Pollution and its Control: vol- 1,2,4,5,6 
<br/><br/><label>Dewey Class. No.: </label>614.703  / CHH/E