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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hardenburg, Robert Earle, - Watada, Alley E. - Wang, Chien Yi. - United States. Agricultural Research Service.
    Edition: Rev. Sept. 1986. --
    Publication info: [Washington, D.C.], U.S. Dept. of Agriculture, Agricultural Research Service, 1986
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Hardenburg, Robert Earle,
    Publication info: Washington], U.S. Dept. of Agriculture, Agricultural Research Service, 1967
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library