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Whistling Thorn

Helen Cowcher

出版	Scholastic, 1993
ISBN	05904942529780590494250
URL	http://books.google.com.hk/books?id=p8abUCXmWrsC&hl=&source=gbs_api

註釋

Explains how the acacia evolved its own protection against browsing animals and helped create a balanced natural environment.