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Forests and Trees of the Western National Parks

James SilverU.S. Fish and Wildlife ServiceUnited States. Bureau of Animal IndustryUnited States. National Park ServiceFrancis Earl GarloughHarold Edwards BaileyRalph Bernard NestlerWaldo Lee McAteeVirginia Long BaileyWoodrow Wilson Bailey

出版	U.S. Government Printing Office, 1941
URL	http://books.google.com.hk/books?id=2YYYWTvnn0MC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN