- Forests and forestry -- Northwest, Pacific[remove]52
- United States. Forest Service. Pacific Northwest Region27
- United States. Forest Service. Pacific Northwest Region. Thirty Year Club27
- Forests and forestry -- Research -- Northwest, Pacific19
- Pacific Northwest Forest and Range Experiment Station (Portland, Or.)17
- Forestry research -- Northwest, Pacific2
- Pacific Northwest Forest 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
- Western Forestry and Conservation Association1
- Wildlife conservation -- Northwest, Pacific1