- Riparian areas -- Northwest, Pacific8
- Forest ecology -- Northwest, Pacific7
- Riparian ecology -- Northwest, Pacific7
- Stream conservation -- Northwest, Pacific7
- Wildlife habitat improvement -- Northwest, Pacific7
- Coastal ecology -- Oregon (State) -- Periodicals4
- Coastal ecology -- Washington (State) -- Periodicals4
- Pacific Northwest Coastal Ecosystems Regional Study -- Periodicals4
- Carbon cycle (Biogeochemistry) -- Northwest, Pacific3
- Riparian ecology -- Oregon3
- Stream ecology -- Northwest, Pacific3
- Forests and forestry -- Northwest, Pacific2
- Grasses -- Ecology -- Northwest, Pacific2
- Northwest, Pacific2
- Nutrient cycles -- Northwest, Pacific2
- Soil microbial ecology -- Northwest, Pacific2
- Stream-gaging stations2
- Thermal pollution of rivers, lakes, etc2
- Understory plants -- Northwest, Pacific2
- Anura -- Ecology -- Northwest, Pacific1