Subject
- Agriculture -- Oregon -- Statistics49
- Farm produce -- Oregon -- Statistics49
- Range plants -- Oregon44
- American wood28
- Wood -- United States24
- 4-H clubs12
- Agriculture -- Oregon12
- Agriculture11
- Water resources development -- Oregon -- Willamette River Valley8
- Frozen seafood7
- Oregon. Natural Area Preserves Advisory Committee7
- Soil conservation -- Oregon -- Willamette River Valley7
- Upper Willamette Resource Conservation and Development Project7
- Natural areas – Oregon5
- Nature conservation – Oregon5
- Reforestation -- Oregon5
- Aquatic invertebrates -- Oregon4
- Catalogs, Publishers' -- Oregon4
- College publications -- Oregon4
- Forests and forestry -- Research -- Oregon4