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Progress Report on Alfalfa Investigations Conducted at the U.S. Forage Crop Field Station, West Point, Mississippi, 1925 to 1928, Inclusive
United States. Bureau of Plant Industry. Office of Forage Crop InvestigationsHarvey Leroy Westover
出版1929
URLhttp://books.google.com.hk/books?id=0zkJSQAACAAJ&hl=&source=gbs_api