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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hole, Erling, - Vermeer, James,
    Publication info: Washington, D.C, Agricultural Research Service, U.S. Dept. of Agriculture, 1960
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Hole, Erling, - Bondurant, John H. - Kentucky Agricultural Experiment Station - United States. Bureau of Agricultural Economics.
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, Bureau of Agricultural Economics, 1951
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library