Subject
- Douglas fir -- Seedlings3
- Reforestation -- Oregon3
- Crawler tractors -- Oregon2
- Douglas fir -- Bibliography2
- Douglas fir -- Harvesting -- Oregon2
- Forest thinning -- Oregon2
- Logging, Skyline2
- Lumber trade -- Oregon2
- Trees -- Oregon -- Measurement2
- Wood -- Preservation2
- Animals in logging -- Oregon1
- Bark1
- Black cottonwood -- Oregon -- Willamette River Valley -- Growth1
- Brush -- Control -- Oregon1
- Buffer zones (Ecosystem management) -- Oregon1
- Burning of land1
- Conifers -- Oregon -- Growth -- Mathematical models1
- Conifers -- Seedlings -- Storage1
- Conifers -- Wounds and injuries1
- Douglas fir1