- Forests and forestry -- Northwest, Pacific[remove]14
- United States. Forest Service. Pacific Northwest Region7
- United States. Forest Service. Pacific Northwest Region. Thirty Year Club7
- Forests and forestry -- Research -- Northwest, Pacific3
- Forestry research -- Northwest, Pacific2
- Pacific Northwest Forest and Range Experiment Station (Portland, Or.)2
- Forest management1
- Forest management -- Environmental aspects -- Northwest, Pacific1
- Habitat (Ecology)1
- Northern spotted owl -- Northwest, Pacific1
- Old growth forests -- Government policy -- Northwest, Pacific1
- Old growth forests -- Northwest, Pacific1
- Pacific Northwest Forest Experiment Station (Portland, Or.)1
- Wildlife conservation -- Northwest, Pacific1