Verma, P. S. <br/><br/>
Environmental biology  principles of ecology 
P. S. Verma and V. K. Agarwal 
 - New Delhi  S. chand  2000 
 - 590p.ill 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>8121908590  90 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology
<br/><br/><label>Dewey Class. No.: </label>577  / V522