401 Brooks Hall,West Virginia UniversityMorgantown, WV 26506-6067

Forestry CommissionNorthern Research StationRoslin, Midlothian, UK EH25 9SY

Forestry CommissionNorthern Research StationRoslin, Midlothian, UK EH25 9SY

Forestry Service,Midlothian, Scotland

USDA-ARS ERRC 600 E. Mermaid Lane
Wyndmore, PA 19038

Soil-Microbial Systems LaboratoryRoom 108, Building 318, BARC East10300 Baltimore AvenueBeltsville, MD 20705-2350

Cornell University

New York State Agric. Expt. StationSodus, Geneva, NY