作者 | Boyd E. Wickman / C. T. Dyrness / Edward J. Dimock / J. Alan Wagar / James W. Edgren / Marlin E. Plank / Richard L. Williamson / Richard O. Woodfin / Richard R. Mason / Richard W. Haynes / Torolf R. Torgersen / Ward W. Carson / Wilbur A. Farr / Pacific Northwest Forest and Range Experiment Station (Portland, Or.) / John W. Henley |