Rao,  Venugopala P <br/><br/>
Textbook of Environmental Engineering 

 - New Delhi:  Prentice Hall of India,  2003. 
 - 268p.; 
<br/><br/><label>ISBN: </label>9788120319301 
<br/><br/><label>Dewey Class. No.: </label>628 RAO/T