Sharma, P D <br/><br/>
Environmental biology 

 - 2 
 -  Rastogi & Company, Meerut  1998 
 - 136 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology; Biology
<br/><br/><label>Dewey Class. No.: </label>574.5  SHA-E2