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Feeding and Management Investigations at the United States Dairy Experiment Station at Beltsville, Md., 1932 Report
Thompson Elwyn WoodwardRoy Ralph GravesJoseph Benjamin Shepherd
出版U.S. Department of Agriculture, 1933
URLhttp://books.google.com.hk/books?id=Dr96l3hfd4EC&hl=&source=gbs_api
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