1. USDA-ARS; 2611 W. Lucas St. Florence SC 29501
2. Dep. of Forestry; Univ. of Kentucky; Lexington KY 40546
3. Biosystems and Agricultural Engineering, Univ. of Kentucky; Lexington KY 40546
4. USDI, Office of Surface Mining, Reclamation and Enforcement; London KY 40741