Institution: | 1.U.S. Forest Service, Northern Research Station, York, PA, USA ;2.U.S. Forest Service, Northern Research Station, Syracuse, NY, USA ;3.Davey Institute, Philadelphia, PA, USA ;4.University of Minnesota, St. Paul, MN, USA ;5.U.S. Forest Service, Northern Research Station, Tofte, MN, USA ;6.U.S. Forest Service, Northern Research Station, Baltimore, MD, USA ; |