Callenbach, Ernest. <br/><br/>
Ecology /  
Ernest Callenbach. 
 - Hyderabad :   Universities Press ,   1999. 
 - 6 ,154p. :   ills,figs ;   23cm .  
<br/><br/>NULL 
<br/><br/><label>ISBN: </label>817371178X  Rs.125.00 
<br/><br/><label>Subjects--Index Terms: </label>ECOLOGY 
<br/><br/><label>Dewey Class. No.: </label>577  / CAL/E