Subject
- Alkali-aggregate reactions2
- Aggregates (Building materials) -- Recycling1
- Aluminum oxide1
- Clay soils1
- Concrete -- Additives1
- Concrete -- Chemistry1
- Constructed wetlands -- Oregon -- Woodburn1
- Dam retirement -- Oregon -- Brownsville1
- Dams -- Environmental aspects -- China1
- Dams -- Environmental aspects -- Oregon -- Calapooia River1
- Douglas fir -- Mechanical properties -- Testing1
- Effluent quality -- Oregon -- Woodburn1
- Fly ash1
- Forest roads -- Design and construction1
- Hydroelectric power plants -- Environmental aspects -- China1
- Hydrology1
- Hyporheic zones -- Oregon -- Woodburn1
- River sediments -- Oregon -- Calapooia River1
- Roads -- Foundations -- Oregon, Western1
- Roads -- Inspection -- Technological innovations1