- Wildlife conservation -- Northwest, Pacific2
- Aquatic invertebrates -- Effect of pesticides on -- Northwest, Pacific1
- Climatic changes -- Northwest, Pacific1
- Conservation tillage -- Northwest, Pacific1
- Crops and climate -- Northwest, Pacific1
- Elymus -- Ecology -- Northwest, Pacific1
- Fishery management, International -- Northwest, Pacific1
- Forest biodiversity -- Northwest, Pacific1
- Forest biodiversity conservation -- Northwest, Pacific1
- Grasses -- Ecology -- Northwest, Pacific1
- Green tree retention -- Northwest, Pacific1
- Invasive plants -- Ecology -- Northwest, Pacific1
- Logging -- Environmental aspects -- Northwest, Pacific -- Statistical methods1
- Mammals -- Effect of logging on -- Northwest, Pacific -- Statistical methods1
- Northwest Power Planning Council (U.S.)1
- Pesticides -- Environmental aspects -- Northwest, Pacific1
- Plant conservation -- Northwest, Pacific1
- Rare plants -- Northwest, Pacific1
- Regional planning -- Northwest, Pacific1
- Riparian forests -- Ecology -- Northwest, Pacific -- Computer simulation1