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  1. By: Yerkes, Arnold Phipps, - Mowry, H. H. (Herbert Hager),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1915
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Farm tractors  
  2. By: Tolley, H. R. (Howard Ross), - Reynoldson, L. A. (Le Roy August),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1921
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Energy consumption  Farm tractors  Farms  
  3. 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