Gopal, Brij  . <br/><br/>
Elements of ecology /  
by Brij Gopal and N. Bhardwaj. 
 - New Delhi :   Vikas Publishing House  ,   1979 
 - vi, 200 p. :  
<br/><br/><label>ISBN: </label>0 7069 0754 X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecosystems
<br/><br/><label>Dewey Class. No.: </label>I:5  / L9