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

 - 6th . Ed. 
 - New Delhi  S.Chand & Company Ltd  2002 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Civil Engineering
<br/><br/><label>Dewey Class. No.: </label>628  / DU-E