Duggal, K.N. <br/><br/>
Elements of environmental engineering  

 - 6th ed 
 - New Delhi  S.Chand & Co.  1996 
 - vi,504p. 
<br/><br/><label>ISBN: </label>81-219-1547-3 
<br/><br/><label>Subjects--Index Terms: </label>Environmental Engineering  Water Supply  Sewage Disposal  Environmental sanitation 
<br/><br/><label>Universal Decimal Class. No.: </label>628.39  / DUG