1. Department of Geosciences and Natural ResourcesWestern Carolina UniversityCullowhee North Carolina USA
2. U.S. Forest Service Northern Research Station, Hubbard Brook Experimental ForestNorth Woodstock New Hampshire USA
3. Virginia Water Resources Research Center, Department of Forest Resources and Environmental ConservationVirginia TechBlacksburg Virginia USA
4. USGS New England Water Science CenterMontpelier Vermont USA