Textbook of environmental engineering / 
Rao, P.V. 
 - Delhi :  PHI limited,   c2015. 
 - xii, 268 p.   ill. ;  24 cm. 
<br/><br/>Includes index and bibliographical references 
<br/><br/>
<br/><br/><label>ISBN: </label>9788120319301 
<br/><br/><label>Dewey Class. No.: </label>628/  / RAT