Dilip kumar markandey <br/><br/>
Environmental surveillance 
by Dilip Kumar Markandey 
 - New Delhi  A.P.H Publishing Corporation  c2006 
 - Various Pages 
 -  3 volume set .
<br/><br/><label>ISBN: </label>81-313-0006-4 
<br/><br/><label>Dewey Class. No.: </label>363.17