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Geographic Changes in the Production of Cattle and Calves in the North Central Region

Cleo FitzsimmonsCraig Eugene BeerGeorge Wells LaddRichard DamRonald Gordon FraaseGordon W. ErlandsonRobert Lee Oehrtman

出版	North Dakota Agricultural Experiment Station, North Dakota State University of Agriculture and Applied Science, 1970
URL	http://books.google.com.hk/books?id=doffAQAACAAJ&hl=&source=gbs_api