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Swine Research Conducted by the Animal Husbandry Division, Bureau of Animal Industry, at the Agricultural Research Center, Beltsville, Maryland

United States. Bureau of Animal Industry

出版	U.S. Department of Agriculture, Bureau of Animal Industry, 1949
URL	http://books.google.com.hk/books?id=VYqhtwAACAAJ&hl=&source=gbs_api