Verma, P. S. <br/><br/>
Principles of ecology: Environmental biology 

 - New Delhi  S. Chand  1982 
 - 228p. 
<br/><br/><label>ISBN: </label> RS 12.00 
<br/><br/><label>Source: </label> RS 12.00 
<br/><br/><label>Dewey Class. No.: </label>574.5 VER