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