AGARWAL, V.K. VERMA, P.S. <br/><br/>
ENVIRONMENTAL BIOLOGY: PRINCIPLES OF ECOLOGY 

 - New Delhi  S.Chand and Company Ltd., New Delhi   1996 
<br/><br/><label>ISBN: </label>81 219 0859 0 
<br/><br/><label>Dewey Class. No.: </label>577  / VER/E