1. U.S. Department of Agriculture, Forest Service; Pacific Northwest Research Station; Juneau Alaska 99801 USA
2. U.S. Geological Survey; Forest and Rangeland Ecosystem Science Center; Boise Idaho 83706 USA
3. U.S. Bureau of Reclamation; Portland Oregon 97232 USA
4. U.S. Bureau of Reclamation; Denver Colorado 80225 USA