1. Department Ciencias del Medio Natural; Universidad Pública de Navarra; Pamplona Navarra Spain
2. U.S.D.A. Forest Service; Rocky Mountain Research Station; Moscow ID
3. Michigan Technological University; Houghton MI
4. B.C. Ministry of Forests, Lands and Natural Resource Operations; Nelson BC Canada
5. U.S.D.A. Forest Service, Rocky Mountain Research Station; Moscow ID