Gopal, Brij. <br/><br/>
Elements of ecology / 
Brij Gopal, N. Bhardwaj 
 - New Delhi :  Vikas Publ. House,  1979 
 - 200 p. :  ill. ;  22 cm. 
<br/><br/>Includes bibliographical references (p.177-196) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology
<br/><br/><label>Dewey Class. No.: </label>574.5 GOP