Britannica Lessons : Books X Biology .Our Environment II 

 - New Delhi:  Encyclopedia Britannica,  2002. 
 - vi,90p.;  28 cm 
<br/><br/><label>ISBN: </label>81-7991-026-1 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biology
<br/><br/><label>Dewey Class. No.: </label>570  / BRI