Verma , P.S. . <br/><br/>
Principles of Ecology /  Textual Documents 
P.S. Verma and V.K. Agarwal. 
 - 4th ed. / 
 - New Delhi :  S. Chand & Company ,  1989. 
 - viii,591p. :  ill ;  22cm. . 
<br/><br/>Index 
<br/><br/><label>ISBN: </label> Rs. 40.00 (PB) 
<br/><br/><label>Subjects--Index Terms: </label>Botany Plant Ecology G-Botany 
<br/><br/><label>Dewey Class. No.: </label>581.5  / Ve 58 Pr