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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hawkins, Lon A. (Lon Adrian), - Barger, W. R.
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1926
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Barger, W. R. - Hawkins, Lon A. (Lon Adrian),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1926
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Barger, W. R. - Pentzer, W. T. (Wilbur Tibbils), - United States. Bureau of Plant Industry, Soils, and Agricultural Engineering.
    Publication info: Fresno, Calif, U.S. Dept. of Agriculture, Agricultural Research Administration, Bureau of Plant Industry, Soils, and Agricultural Engineering, 1948
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  4. By: Barger, W. R. - United States. Bureau of Plant Industry, Soils, and Agricultural Engineering.
    Publication info: [Beltsville, Md.?], U.S. Dept. of Agriculture, Agricultural Research Administration, Bureau of Plant Industry, Soils, and Agricultural Engineering, [1951?]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library