1. USDA Agricultural Research Service, Bacterial Epidemiology and Antimicrobial Resistance Research UnitU.S. National Poultry Research Center, 950 College Station Rd Athens GA 30605
2. Department of Earth and Environmental SciencesUniversity of Kentucky, 101 Slone Research Bldg. Lexington KY 40506‐0053
3. Kentucky Geological SurveyUniversity of Kentucky, 228 Mining and Mineral Resources Bldg. Lexington KY 40506‐0107