Subject
- Reforestation -- Oregon17
- Forests and forestry -- Research -- Oregon15
- Grapes -- Diseases and pests -- Control -- Oregon11
- Spraying and dusting in agriculture -- Oregon11
- Viticulture -- Oregon10
- Catalogs, Publishers' -- Oregon9
- College publications -- Oregon9
- 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
- 4-H clubs5
- Apples -- Diseases and pests -- Control -- Columbia River Valley5
- Cherry -- Diseases and pests -- Control -- Columbia River Valley5
- Pear -- Diseases and pests -- Control -- Columbia River Valley5
- Agricultural extension work -- Oregon -- Video catalogs4
- Agricultural pests -- Control -- Oregon -- Willamette River Valley4
- Fruit -- Diseases and pests -- Oregon -- Willamette River Valley4
- Pesticides -- Application -- Oregon -- Willamette River Valley4