Verma, P. S. <br/><br/>
Environmental Biology   principles of ecology 
P. S. Verma 
 - New Delhi  S. Chand & Company  1998 
 - 591p. 
<br/><br/><label>ISBN: </label>9788121908597  80.00 
<br/><br/><label>Dewey Class. No.: </label>574 V59E