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  1. By: Smith, Edwin. - Adams, David. - 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