Chhatwal G.R <br/><br/>
Encyclopaedia of Environmental Technology 
/ by G.R Chhatwal 
 - 1st ed. 
 - New Delhi  Anmol Publications Pvt  1999 
 - 364p. 
<br/><br/><label>ISBN: </label>8126102071 
<br/><br/><label>Dewey Class. No.: </label>620.803  / CHH/E