Rao . Venugopala . P <br/><br/>
Principles of Environmental Science and Engineering 

 - New Delhi  PHI Learning Private Limited   2010 
 - 276 p. 
<br/><br/><label>ISBN: </label>978-81-203-2893-8 
<br/><br/><label>Dewey Class. No.: </label>620.8  / RAO