1. USDA Agricultural Research Service, Pasture Systems and Watershed Management Research Unit; University Park PA 16802
2. USDA Agricultural Research Service, Range Management Research Unit; Las Cruces NM 88003
3. University of Saskatchewan, School of Environment and Sustainability; Saskatoon SK S7N 5B5
4. University Wisconsin-Green Bay; Department of Natural and Applied Sciences; Green Bay WI 54311
5. Mississippi State University; Civil and Environmental Engineering Dept; Mississippi State MS 39762