1. USDA-ARS; Hydrology and Remote Sensing Lab.; Bldg. 007, Rm. 126, BARC-West, 10300 Baltimore Blvd. Beltsville MD 20705
2. USDA-ARS; Natural Resource Conservation Center; Watkinsville GA 30677
3. Dep. of Agronomy and Soils; Auburn Univ.; Auburn AL 36849
4. USDA-ARS; National Soil Dynamics Lab.; Auburn AL 36832