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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Johnson, Wendell C. (Wendell Clifford), - Davis, Ronald G. - United States. Agricultural Research Service. Soil and Water Conservation Research Division.
    Publication info: Beltsville, M.D, U.S. Department of Agriculture, Agricultural Research Service, 1970
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library