Subject
- Indians of North America -- Oregon -- Antiquities3
- Oregon -- Antiquities3
- Riparian ecology -- Oregon3
- Wetland ecology -- Oregon -- Willamette River Valley3
- Birds -- Habitat -- Oregon -- Willamette River Valley2
- Cascadia Subduction Zone2
- Coho salmon2
- Dam retirement -- Oregon -- Calapooia River2
- Engineered log jams (Hydraulic engineering) -- Oregon -- Calapooia River2
- Excavations (Archaeology) -- Oregon -- Fort Yamhill2
- Fish stock identification -- Genetic aspects2
- Forest dynamics -- Oregon2
- Forest roads2
- Forest roads -- Environmental aspects -- Oregon, Western2
- Forest roads -- Oregon -- Oak Creek Watershed (Benton County)2
- Fort Yamhill (Or.) -- Antiquities2
- Fort Yamhill (Or.) -- History -- 19th century2
- Hydrology, Forest -- Oregon -- Oak Creek Watershed (Benton County)2
- Lakes -- Oregon2
- Land use -- Oregon -- Calapooia River Watershed2