1. Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA 30602, USA.
2. Department of Wood Science and Engineering, Oregon State University, Corvallis, OR 97331, USA.
3. Southern Timberlands R&D, Weyerhaeuser Co., Columbus, MS 39704, USA.
4. USDA Forest Service, Southern Research Station, Athens, GA 30602, USA.
5. School of Forestry, University of Canterbury, Private Bag 4800, Christchurch, New Zealand.
6. University of Florida, Gainesville, FL 32605, USA.