1. USDA-ARS, Coastal Plains Soil, Water, and Plant Research Center; 2611 W. Lucas St. Florence SC 29501
2. Dep. of Geographical Sciences; Univ. of Maryland; College Park MD
3. Dep. of Environmental Science and Technology; Univ. of Maryland; College Park MD
4. USDA-ARS, Hydrology and Remote Sensing Lab.; Beltsville MD