Subject
- Douglas fir32
- Forests and forestry -- Measurement14
- Forests and forestry -- Oregon13
- Forests and forestry9
- Forest fires -- Prevention and control8
- Forest management8
- Forestry schools and education5
- Lumber -- Drying5
- Lumber trade -- Northwest, Pacific5
- United States. Forest Service5
- Wood waste -- Recycling5
- Forest reserves -- United States4
- Log transportation4
- Logging4
- McDonald Forest (Or.)4
- Plant hormones4
- Ponderosa pine4
- Reforestation -- Oregon4
- Western hemlock4
- Wooden-frame houses4