Subject
- Watershed management -- Columbia River Watershed2
- Abandoned mined lands reclamation -- Social aspects -- Oregon -- Willamette River Valley1
- Aggregate industry -- Environmental aspects -- Oregon -- Willamette River Valley1
- Agricultural Water Enhancement Program1
- Agricultural conservation -- Oregon -- Malheur County -- Public opinion1
- Agricultural laborers -- China1
- Agricultural pollution -- China -- Dian Lake -- Prevention1
- Agriculture -- China1
- Agriculture -- Technology transfer -- Social aspects -- Oregon1
- Arid regions agriculture -- China1
- Buffer zones (Ecosystem management) -- Government policy -- Oregon -- Oregon Coast Range1
- Capital movement -- Simulation games1
- Chiloquin Dam (Or.)1
- Coho salmon -- Habitat -- Government policy -- Oregon -- Oregon Coast Range1
- Columbia River Treaty (1961 January 17)1
- Columbia River Watershed -- In motion pictures1
- Conflict management -- West (U.S.)1
- Conflict management -- West (U.S.) -- Public opinion1
- Conservation projects (Natural resources) -- Oregon -- Wood River Valley -- Public opinion1
- Dam retirement1