Subject
- Abandoned mined lands reclamation -- Social aspects -- Oregon -- Willamette River Valley1
- Abandoned mined lands reclamation -- West (U.S.)1
- Aggregate industry -- Environmental aspects -- Oregon -- Willamette River Valley1
- Floodplain management -- Social aspects -- Oregon -- Willamette River Valley1
- Land use, Rural -- Social aspects -- Oregon -- Willamette River Valley1
- Natural resources -- Multiple use -- Oregon -- Willamette River Valley1
- Sand and gravel mines and mining -- West (U.S.)1