- Soft wheat -- Fertilizers -- Oregon, Western2
- Soft wheat -- Soils -- Oregon, Western2
- Winter wheat -- Fertilizers -- Oregon, Western2
- Winter wheat -- Soils -- Oregon, Western2
- 4-H clubs1
- Apples -- Fertilizers1
- Blackberries -- Fertilizers -- Oregon, Western1
- Blackberries -- Oregon, Western -- Nutrition1
- Canola -- Fertilizers -- Northwest, Pacific1
- Carrots -- Fertilizers -- Oregon, Eastern1
- Carrots -- Seeds -- Oregon, Eastern1
- Corn -- Silage -- Oregon1
- Cranberries -- Fertilizers -- Oregon1
- Deficiency diseases in plants1
- Deficiency diseases in plants -- Diagnosis1
- Deficiency diseases in plants -- Oregon, Western1
- Fog -- Northwest, Pacific1
- Food -- Preservation -- Study and teaching1
- Hazelnuts -- Fertilizers1
- Hazelnuts -- Nutrition1