Subject
- 4-H clubs41
- Reforestation -- Oregon40
- Forests and forestry -- Research -- Oregon37
- Catalogs, Publishers' -- Oregon19
- College publications -- Oregon19
- Pesticides -- Application -- Oregon -- Willamette River Valley14
- Spraying and dusting in agriculture -- Oregon -- Willamette River Valley14
- Spraying and dusting in agriculture -- Oregon12
- Grapes -- Diseases and pests -- Control -- Oregon11
- Agriculture -- Oregon -- Statistics10
- Viticulture -- Oregon10
- Agricultural estimating and reporting -- Oregon8
- Cherry -- Diseases and pests -- Control -- Oregon -- Willamette River Valley8
- Farm produce -- Oregon -- Statistics8
- Fungicides -- Oregon8
- Pesticides -- Application -- Oregon8
- Fruit -- Diseases and pests -- Control -- Columbia River Valley7
- Pesticides -- Application -- Columbia River Valley7
- Spraying and dusting in agriculture -- Columbia River Valley7
- Agricultural pests -- Control -- Willamette River Valley (Or.)6