著者
- Northeastern Forest Experiment Station (Radnor, Pa.)
- United States. Forest Service 2 結果
- Birch Symposium University of New Hampshire 1 結果
- Northeastern Forest Experiment Station (Radnor, Pa.). Research paper NE 1 結果
- Oak Symposium Morgantown, W.Va 1 結果
- Shigo, Alex L., 1930- 1 結果
- University of New Hampshire. Dept. of Forest Resources 1 結果