Subject
- Water -- Pollution -- Oregon39
- Air -- Pollution -- Oregon37
- Environmental policy -- Oregon37
- Columbia Basin Agricultural Research Center -- Periodicals28
- Forests and forestry -- Oregon28
- Forests and forestry24
- Forests and forestry -- Research -- Oregon23
- Agriculture -- Research -- Columbia River Watershed21
- Reforestation -- Oregon18
- Hydrology -- Research -- Oregon17
- Forest management -- Research -- Oregon12
- Herbicides -- Research -- Oregon12
- Reforestation -- California, Northern11
- Wood poles -- Maintenance and repair11
- Wood poles -- Preservation11
- Douglas fir10
- Contributions in education and outreach9
- Forests and forestry -- Oregon -- Measurement9
- Lumber -- Drying9
- Water resources development -- Oregon9