Subject
- Reforestation -- Oregon10
- Forests and forestry -- Oregon -- Measurement8
- Forests and forestry -- Measurement7
- Wood -- Preservation7
- Douglas fir6
- Douglas fir -- Seedlings5
- Forest management -- Oregon5
- Logging -- Machinery5
- Forests and forestry -- Oregon4
- Forests and forestry -- Oregon -- Measurement -- Mathematical models4
- Fungicides4
- Logging, Skyline4
- Trees -- Oregon -- Measurement4
- Wood preservatives4
- Brush -- Control -- Oregon3
- Forest thinning -- Oregon3
- Fuelwood3
- Herbicides -- Oregon3
- Rodenticides3
- Tree planting -- Oregon3