Ashok Kumar Srivastava <br/><br/>
Air pollution  biopollutants in air 

 - 1st Ed. 
 - New delhi  Ashish publishing house  1991 
 - 302 
<br/><br/><label>ISBN: </label>8170244196 
<br/><br/><label>Dewey Class. No.: </label>614  / ASH/AI