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Conservation Assessment for the Dusky Canada Goose (Branta Canadensis Occidentalis Baird)

出版	U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 2003
URL	http://books.google.com.hk/books?id=TMM2B5fxvJcC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN