Duggal K N <br/><br/>
Element of environmental engineering 
Duggal K N 
 - New Delhi  S Chand  2006 
 - 496p 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Environmental engineering
<br/><br/><label>Dewey Class. No.: </label>628 DU-E