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- Soil conservation -- Economic aspects -- Oregon 1
- Soil conservation -- Idaho -- Camas Prairie 1
- Soil conservation -- Lower Columbia River Watershed (Or. and Wash.) 1
- Soil conservation -- Northwest, Pacific 1
- Soil conservation -- Northwest, Pacific -- Research 1
- Soil conservation -- Oregon 2
- Soil conservation -- Oregon -- Public opinion 2
- Soil conservation -- Oregon, Western 2
- Soil conservation -- Research -- Idaho -- Mission-Lapwai Watershed 1
- Soil contamination 3
- Soil decontamination 2
- soil desinfection 1
- soil deterioration 2
- Soil Disturbance 1
- Soil enzyme activities 1
- soil erodibility 1
- Soil erosion 2
- Soil erosion -- Climatic factors -- Oregon 6
- Soil erosion -- Climatic factors -- Washington (State) 3
- Soil erosion -- Columbia River Valley -- Prevention 1