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Proceedings of the Sixteenth Annual Meeting of the American Association of Farmers' Institute Workers, Held at Columbus, Ohio, November 13, 14, 1911
American Association of Farmers' Institute Workers. MeetingUnited States. Department of Agriculture
出版U.S. Department of Agriculture, Office of Experiment Stations, 1912
URLhttp://books.google.com.hk/books?id=_kh40AEACAAJ&hl=&source=gbs_api