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  1. By: Widmann, Richard H. - Northeastern Forest Experiment Station (Radnor, Pa.)
    Publication info: Radnor, PA :U.S. Dept. of Agriculture, Forest Service, Northeastern Forest Experiment Station,[1995]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Frieswyk, Thomas S. - Widmann, Richard H. - United States. Forest Service. - United States. Forest Service. Northeastern Research Station.
    Publication info: Newton Square, PA :U.S. Dept. of Agriculture, Forest Service, Northeastern Research Station,[2000]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Frieswyk, Thomas S. - Widmann, Richard H. - United States. Forest Service. - United States. Forest Service. Northeastern Research Station.
    Publication info: Newton Square, PA :U.S. Dept. of Agriculture, Forest Service, Northeastern Research Station,[2000]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  4. 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
  5. By: Widmann, Richard H. - Birch, Thomas W. - Northeastern Forest Experiment Station (Radnor, Pa.)
    Publication info: Broomall, PA :Northeastern Forest Experiment Station,[1988]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  6. By: 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,[2005]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  7. By: Widmann, Richard H. - United States. Forest Service. - United States. Forest Service. Northeastern Research Station.
    Publication info: Newton Square, PA :U.S. Dept. of Agriculture, Forest Service, Northeastern Research Station ;[2002?]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  8. By: Widmann, Richard H. - Maryland. Forest Service. - United States. Forest Service. - United States. Forest Service. Northeastern Research Station.
    Publication info: Newton Square, PA :U.S. Dept. of Agriculture, Forest Service, Northeastern Research Station ;[2002?]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  9. By: Widmann, Richard H. - United States. Forest Service. - United States. Forest Service. Northeastern Research Station.
    Publication info: Newton Square, PA :U.S. Dept. of Agriculture, Forest Service, Northeastern Research Station ;[2002?]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  10. By: Widmann, Richard H. - United States. Forest Service. - United States. Forest Service. Northeastern Research Station.
    Publication info: Newton Square, PA :U.S. Dept. of Agriculture, Forest Service, Northeastern Research Station ;[2002?]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library