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By: Tolley, H. R. (Howard Ross), - Reynoldson, L. A. (Le Roy August),Edition:Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1921Volume: no.997 (1921)Series:Holding Institution: U.S. Department of Agriculture, National Agricultural LibrarySubjects: Energy consumption Farm tractors FarmsBHL Collections:
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By: Yerkes, Arnold Phipps, - Mowry, H. H. (Herbert Hager),Edition:Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1915Volume: no.174 (1915)Series:Holding Institution: U.S. Department of Agriculture, National Agricultural LibrarySubjects: Farm tractorsBHL Collections:
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By: Tolley, H. R. (Howard Ross), - Humphries, W. R. (Walter Raymond),Edition:Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1924Volume: no.1202 (1924)Series:Holding Institution: U.S. Department of Agriculture, National Agricultural LibrarySubjects: Farm mechanization Farm tractors Horses Kansas Nebraska OklahomaBHL Collections: