1. USDA-ARS; Hydrology and Remote Sensing Lab.; Bldg. 007, Rm. 126, BARC-West, 10300 Baltimore Blvd. Beltsville MD 20705
2. Dep. of Agronomy and Soils; Auburn Univ.; Auburn AL 36849
3. USDA-ARS; Natural Resource Conserv. Center; 1420 Experiment Station Rd Watkinsville GA 30677
4. USDA-ARS; National Soil Dynamics Lab.; Auburn AL 36832
5. USDA-NRCS; Temple TX 76501
6. Joint Global Change Research Institute; Pacific Northwest National Lab.; Univ. of Maryland; College Park MD 20740