Verma,P.S, <br/><br/>
Environmental biology (Principles of Ecology)   

 - 1st /   2006. 
 - Delhi:  S,Chand & Co.Ltd.  2006. 
 - 591p.:  24cm. 
<br/><br/><label>Subjects--Personal Names: </label><br/>Environment, Environmental Biology. 
<br/><br/><label>Dewey Class. No.: </label>574.52