V.K. Agarwal Verma, P.S. <br/><br/>
Priciples of Ecology 
/ by P.S. Verma 
 - 4th ed. 
 - New Delhi :  S. Chand and Company,  1989 
 - VIII, 591 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biology
<br/><br/><label>Subjects--Facted Index Terms: </label><br/>Principles of Ecology
<br/><br/><label>Dewey Class. No.: </label>577  / VER-P4