VERMA, P. S. <br/><br/>
CONCEPTS OF ECOLOGY ENVIRONMENTAL BIOLOGY 

 - NEW DELHI  S.CHAND & COMPANY  1998 
 - 264:  22CM. 
<br/><br/><label>Subjects--Index Terms: </label>Ecology 
<br/><br/><label>Dewey Class. No.: </label>577 VER