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Bulletin

George C. ButzGeorge Catchpole WatsonHarry HaywardHenry Prentiss ArmsbyWilliam Frear

出版	Pennsylvania State College Agricultural Experiment Station, 1898
URL	http://books.google.com.hk/books?id=_mNRAQAAMAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN