Ecology and environment / 
edited by M. Radhakrishnaiah and P. Manikya Reddy. 
 - Hyderabad :  B.R. Ambedkar Open University,  2003. 
 - 110 p. ;  25 cm. 
<br/><br/><label>Dewey Class. No.: </label>577 ECO  / 2135