Gopal, Krishan <br/><br/>
Elements of ecology 

 - New Delhi  Vikas Publishing House Pvt. Ltd.   1981 
 - vi,200p. 
<br/><br/><label>ISBN: </label> RS 16.00 
<br/><br/><label>Source: </label> RS 16.00 
<br/><br/><label>Dewey Class. No.: </label>574.5 GOP