Verma, P S; Agarwal, V K <br/><br/>
Principles of ecology 

 - 3 
 -  S Chand & Company Pvt Ltd., New Delhi  1986 
 - 591 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology; Biology
<br/><br/><label>Dewey Class. No.: </label>574.5  VER-P3