Subject
- Groundwater -- Purification2
- Aeronautics in meteorology -- Oregon -- Oxbow Conservation Area1
- Agricultural pollution -- Management -- Oregon -- Tualatin River Watershed1
- Animal culture -- Environmental aspects -- Oregon -- Tualatin River Watershed1
- Aquifer storage recovery -- Oregon1
- Aquifers1
- Asphalt concrete -- Mixing -- Evaluation1
- Asphalt concrete -- Moisture -- Testing1
- Atomic force microscopy1
- Automobiles, Racing -- Chassis -- Design and construction1
- Boundary layer (Meteorology) -- Oregon -- Oxbow Conservation Area1
- Canned pears1
- Carbon composites1
- Carbon composites -- Design and construction -- Evaluation1
- Carbon fibers1
- Chain saws -- Safety measures1
- Climatic changes -- Washington (State)1
- Composite materials -- Design and construction -- Evaluation1
- Consumers -- Oregon -- Portland -- Attitudes1
- Consumers' preferences -- Oregon -- Portland1