Verma P S. <br/><br/>
Environmental Biology/  principles of ecology 

 - New Delhi  S Chand & Company Limited  2007 
 - vii.591p  ill.  21.5cm 
<br/><br/><label>ISBN: </label>9788121908597 
<br/><br/><label>LC Class. No.: </label>QH308 VER 
<br/><br/><label>Dewey Class. No.: </label>574.5   / VER-E