Gray, Susan H. <br/><br/>
Ecology :  The study of ecosystem / 
Susan H. Gray. 
 - New York :  Scholastic pub,  2012. 
 - 48pages ; colored ; illustrations ;  21 cm 
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<br/><br/><label>ISBN: </label>9780531282694 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology--Study<br/>Ecosystem--Philippines