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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Lorenz, David G. - Sharp, W. Curtis. - Ruffner, Joseph D., - United States. Soil Conservation Service.
    Edition: Rev. Feb. 1989.
    Publication info: [Washington, D.C.?], U.S. Dept. of Agriculture, Soil Conservation Service, 1989
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library