Lal,J.B.  x <br/><br/>
Environmental conservation  x 

 - x 
 - Dehra Dun  International Book Distributors  1987 
 - (9),111 
<br/><br/>x 
<br/><br/><label>ISBN: </label>x 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environment Pollution 
<br/><br/><label>Dewey Class. No.: </label>628.5/L193e