Yadav P.R., <br/><br/>
Environmental air pollution 
by P.R. Yadav 
 - India  Discovery Publishing House  2014 
 - 286P. 
<br/><br/><label>ISBN: </label>978-81-8356-443-4 
<br/><br/><label>Dewey Class. No.: </label>G:55(D854)  / P8