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  1. By: Griffith, Douglas M. - Alerich, Carol L. - Northeastern Forest Experiment Station (Radnor, Pa.)
    Publication info: Radnor, Pa. :U.S. Dept. of Agriculture, Forest Service, Noertheastern Forest Experiment Station,[1996]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Griffith, Douglas M. - Northeastern Forest Experiment Station (Radnor, Pa.)
    Publication info: Radnor, PA :U.S. Dept. of Agriculture, Forest Service, Northeastern Forest Experiment Station,[1993]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Griffith, Douglas M. - Widmann, Richard H. - United States. Forest Service. - United States. Forest Service. Northeastern Research Station.
    Publication info: Newtown Square, PA :U.S. Dept. of Agriculture, Forest Service, Northeastern Research Station,[2003]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library