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Roots of the Farm Problem: Changing Technology, Changing Capital Use, Changing Labor Needs. [By] Earl O. Heady, Edwin O. Haroldsen, Leo V. Mayer, Luther G. Tweeten

Earl Orel Heady

出版	Iowa State University Center for Agricultural and Economic Development, Iowa State University Press, 1965
URL	http://books.google.com.hk/books?id=BZkGMwEACAAJ&hl=&source=gbs_api