1. School of Natural Resources, University of Missouri, Columbia, MO
2. USDA Forest Service, Northern Research Station, Forest Inventory and Analysis, Newtown Square, PA
3. Rubenstein School of Environmental and Natural Resources, University of Vermont, Burlington, VT
4. USDA Forest Service, Northern Research Station, Columbia, MO
5. School of Forest Resources and Environmental Science, Michigan Technological University, Houghton, MI
6. USDA Forest Service, Northern Research Station, University of Maine, Orono, ME
7. USDA Forest Service, Northern Research Station, Rhinelander, WI
8. USDA Forest Service, Northern Research Station, Irvine, PA
9. Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN