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Please read BHL's Acknowledgment of Harmful Content
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  1. By: United States. Agricultural Research Service. - American Society of Agronomy.
    Publication info: [Beltsville, Md.], U.S. Dept. of Agriculture, Agricultural Research Service, 1962
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: American Society of Agronomy.
    Publication info: Washington, D.C, The Society, 1910-1913
    Holding Institution: University Library, University of Illinois Urbana Champaign