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Some Personal, Economic, and Sociological Factors Influencing Dairymen's Actions and Success

C. V. HessPennsylvania State University. Agricultural Experiment StationL. F. Miller

出版	Pennsylvania State University, College of Agriculture, Agricultural Experiment Station, 1954
URL	http://books.google.com.hk/books?id=gmQwzgEACAAJ&hl=&source=gbs_api