1. Department of Forest Engineering Resources and ManagementOregon State University3200 Southwest Jefferson WayCorvallisOregon97331USA
2. U.S. Geological Survey, Northern Rocky Mountain Science Center1648 South 7th AvenueBozemanMontana59717USA
3. Department of Forest ScienceOregon State University3200 Southwest Jefferson WayCorvallisOregon97331USA