Duggal, K N <br/><br/>
Elements of environmental engineering / 
Duggal, K N 
 - 5 ed. 
 -  S. Chand & Company, New Delhi,  1998 
 - p. ;  22 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sanitary and municipal engineering, Environmental protection engineering
<br/><br/><label>Dewey Class. No.: </label>628 DUG-E5