Institution: | 1. USDA Forest Service, Northeastern Area State and Private Forestry, Durham, NH, U.S.A.;2. Great Lakes Forestry Centre, Canadian Forest Service, Natural Resources Canada, Sault Ste. Marie, Canada;3. USDA Forest Service, Southern Research Station, Athens, GA, U.S.A.;4. Atlantic Forestry Centre, Canadian Forest Service, Natural Resources Canada, Fredericton, Canada |