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Productive Life-Span of Dairy Cattle

Raymond Brown BeckerUniversity of Florida. Agricultural Experiment StationP. T. Dix ArnoldA. H. Spurlock

出版	University of Florida Agricultural Experiment Station, 1954
URL	http://books.google.com.hk/books?id=3GdNcgAACAAJ&hl=&source=gbs_api