Verma, P S; Agarwal, V K <br/><br/>
Principles of ecology / 
Verma, P S; Agarwal, V K 
 -  S Chand & Company Pvt Ltd., New Delhi,  1989 
 - p. ;  22 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology; Biodiversity; Conservation
<br/><br/><label>Dewey Class. No.: </label>577 VER-P