Subject
- Groundwater -- Pollution2
- Pesticides -- Environmental aspects2
- Sewage sludge2
- Soil amendments2
- Soil management -- Oregon2
- Soil permeability -- Oregon -- Measurement2
- Soil science -- Oregon2
- Soils -- Oregon2
- Soils -- Pesticide content2
- Waste disposal in the ground2
- Agricultural productivity -- Oregon -- Willamette River Valley1
- Groundwater -- Pollution -- Oregon -- Measurement1
- Pesticides -- Environmental aspects -- Oregon -- Measurement1
- Sewage sludge as fertilizer -- Oregon1
- Soil absorption and adsorption1
- Soil absorption and adsorption -- Oregon -- Measurement1
- Soil physics -- Oregon1
- Soil pollution -- Oregon -- Measurement1
- Soil surveys -- Oregon -- Databases1
- Soils -- Oregon -- Testing1