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  1. By: Warthen, J. D. - United States. Science and Education Administration. Agricultural Research. Northeastern Region.
    Publication info: Beltsville, Md. :Agricultural Research (Northeastern Region), Science and Education Administration, U.S. Dept. of Agriculture,[1978]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Warthen, J. D. - United States. Science and Education Administration. Agricultural Research. Northeastern Region.
    Publication info: Beltsville, Md. :Agricultural Research (Northeastern Region), Science and Education Administration, U.S. Dept. of Agriculture,1979.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library