Sharma, P D <br/><br/>
Elements of ecology 

 - 5 
 -  Rastogi Publications, Meerut  1988 
 - 422 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology; Biology
<br/><br/><label>Dewey Class. No.: </label>PG 574.5  SHA-E5