Subject
- Oregon -- Antiquities4
- Indians of North America -- Oregon -- Antiquities2
- Agricultural systems -- Oregon -- Marys River Region -- History1
- Agriculture -- Oregon -- Lincoln County -- History1
- Antiquities, Prehistoric -- Oregon -- Indian Sands Site1
- Antiquities, Prehistoric -- Oregon -- North Santiam River Watershed1
- Antiquities, Prehistoric -- Snake River Region (Wyo.-Wash.)1
- Antiquities, Prehistoric -- Washington (State)1
- Aquifer storage recovery -- Oregon1
- Archaeological geology -- Northwest, Pacific1
- Archaeological geology -- Oregon -- Upper Klamath Lake Watershed1
- Archaeological surveying -- Oregon -- North Santiam River Watershed1
- Archaeology -- Oregon -- Coquille River1
- Astronomy -- United States -- History -- To 19001
- Athapascan Indians1
- Basalt -- Oregon1
- Biosphere reserves -- Mexico -- Tehuacán River Valley -- Management1
- British Ornithologists' Union -- History1
- Calapooya Mountains (Or.) -- Antiquities1
- Camases -- Habitat -- Geographic information systems -- Oregon1