Lal, J.B.  <br/><br/>
Environmental conservation   
J.B. Lal 
 - Dehra Dun   International Book Distributors   1987 
 - 111p.;  23cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental conservation  <br/>Pollution
<br/><br/><label>Dewey Class. No.: </label>333.72