CHITKARA,M.G <br/><br/>
ENCYCLOPAEDIA OF ECOLOGY, ENVIRONMENT AND POLLUTION - 15 VOLS 

 - NEW DELHI  APH Publishing Corporation  1998 
 - ix+381p.,25x18Cms 
<br/><br/><label>ISBN: </label>81-7024-880-9 
<br/><br/><label>Dewey Class. No.: </label>628.53 C543