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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Redit, W. H. (Walter Henry), - Wright, T. R. (Theodore 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, 1949
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library