Duggal,K.N <br/><br/>
Elements of Environmental Engineering  
k.N.Duggal 
 - New Delhi  S.Chand & Company  2002 
 - 504p. 
<br/><br/> P.B 
<br/><br/><label>ISBN: </label>8121915473 
<br/><br/><label>Dewey Class. No.: </label>628 DUG