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

 - 5th 
 - New Delhi  S.Chand  1998 
 - 496 
<br/><br/>x 
<br/><br/><label>ISBN: </label>8121915473 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental engineering Engineering 
<br/><br/><label>Dewey Class. No.: </label>628/D868e