1. Professor, Dept. of Wood Science and Engineering, Oregon State Univ., Corvallis, OR 97331.
2. Quality Assurance Technician, Freres Lumber Company, 1060 W. Ida St., Stayton, OR 97383.
3. Associate Professor, School of Civil and Construction Engineering, Oregon State Univ., Corvallis, OR 97331 (corresponding author).