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  1. By: Quaintance, Hadly Winfield,
    Publication info: [Madison], Univ. of Wisconsin, 1904
    Holding Institution: University of Toronto - Robarts Library
    Subjects: Agricultural laborers  Agriculture  Economic aspects  Farm mechanization  Labour and labouring classes  United States  
  2. By: Tolley, H. R. (Howard Ross), - Humphries, W. R. (Walter Raymond),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1924
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Farm mechanization  Farm tractors  Horses  Kansas  Nebraska  Oklahoma  
  3. By: Washburn, Raymond Secord, - Scudder, H. D. (Henry Desborough),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1926
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Costs  Farm mechanization  Oregon  Sherman County  Wheat