Rao,P.V <br/><br/>
Textbooks of envirnoment engineering 

 - New Delhi   PHI  2002 
 - xii,268p. p. 
<br/><br/><label>ISBN: </label>81-203-1930-3 
<br/><br/><label>Dewey Class. No.: </label>628. R 18,t