Kotpal, R L; Bali, N P <br/><br/>
Concepts of ecology: Environmental and field biology 

 -  Vishal Publications, Delhi  1986 
 - 264 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology; Biology
<br/><br/><label>Dewey Class. No.: </label>574.5  KOT-C