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Economic Optima in Soil Conservation Farming and Fertilizer Use for Farms in the Ida-Monona Soil Area of Western Iowa

Gerald W. DeanEarl Orel HeadyS. M. A. HusainIowa State College. Agricultural and Home Economics Experiment StationE. R. Duncan

出版	Agricultural and Home Economics Experiment Station, Iowa State College, 1958
URL	http://books.google.com.hk/books?id=kEMlHAAACAAJ&hl=&source=gbs_api