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The Standard Day's Work in Central Illinois
Howard Ross TolleyLilian M. Church
其他書名
Performance of Implements and Crews as Indicated by Reports from 600 Farmers in a Typical Corn-belt Area
出版U.S. Department of Agriculture, 1920
URLhttp://books.google.com.hk/books?id=GVxCAQAAMAAJ&hl=&source=gbs_api
EBookFULL_PUBLIC_DOMAIN
註釋Of results. pp. 2.