1. USDA-NRCS; 100 Centennial Mall N. Lincoln NE 68508
2. USDA-NRCS MLRA Soil Survey Office; 148 E. Pleasant Hill Road, Suite 105 Carbondale IL 62903
3. Plant and Soil Sciences Department; University of Kentucky; Lexington KY 40546-0091
4. Illinois State Geological Survey (retired); 615 E. Peabody Champaign IL 61820
5. USDA-NRCS MLRA Soil Survey Office; Owensboro Service Center; 3032 Alvey Park Dr. W. Owensboro KY 42303
6. USDA Forest Service Northern Research Station; 202 Anheuser-Busch Natural Resources Bldg. University of Missouri Columbia MO 65211-7260