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  1. Cost of using horses, tractors and combines on wheat farms in Sherman County, Oreg. /
    By: Washburn, R. S. - 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  
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  2. The influence of farm machinery on production and labor.
    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  
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  3. Tractors and horses in the winter wheat belt, Oklahoma, Kansas, Nebraska /
    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  
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