1. Dep. of Forest Engineering, Resources, and Management Oregon State Univ. Corvallis OR 97331 USA
2. Weyerhaeuser Company Springfield OR 97477 USA
3. Stand Management Cooperative, School of Environmental and Forest Sciences Univ. of Washington Seattle WA 98195 USA
4. Dep. of Crops and Soil Science Oregon State Univ. Corvallis OR 97331 USA