1. USDA-ARS; Bldg. 3702, Curtin Rd. University Park PA 16802
2. Research Associate; The Pennsylvania State Univ.; University Park PA 16802
3. Hafner Consulting LLC; Washington, DC 20011
4. Dep. of Agricultural & Biological Engineering; Purdue Univ.; 225 South University St. West Lafayette IN 47907-2093
5. Dep. of Agronomy, 215 Plant and Soils; Purdue Univ.; West Lafayette IN 47907-2093