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  1. By: United States. Agricultural Research Service. National Program Staff.
    Publication info: [Washington], National Program Staff, Agricultural Research Service, U.S. Dept. of Agriculture,
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: United States. Agricultural Research Service. National Program Staff.
    Publication info: [Washington, D.C.?], U.S. Dept. of Agriculture, Agricultural Research Service, [1990?]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: United States. Agricultural Research Service. National Program Staff.
    Publication info: [Beltsville, Md.?], U.S. Dept. of Agriculture, Agricultural Research Service, National Program Staff, [1992?]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library