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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hills, Orin A., - Taylor, Edgar A.
    Edition: Rev.
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1959
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Hills, Orin A.,
    Publication info: Washington, D.C, Agricultural Research Service, U.S. Dept. of Agriculture, 1968
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library