Elements of ecology 
Smith, Robert Leo. 
 - 4th ed. update. 
 -  Benjamin Cummings,  2000 
 - xx, 567 p. 
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<br/><br/><label>ISBN: </label>0-321-04280-8 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology.
<br/><br/><label>Dewey Class. No.: </label>577 Sm6e 2000