Subject
- Agricultural pests -- Control -- Congresses27
- Spraying and dusting in agriculture -- Oregon -- Willamette River Valley18
- Climatic changes -- Pacific Ocean17
- Pesticides -- Application -- Oregon -- Willamette River Valley17
- Vegetable gardening -- Oregon11
- Western Dry Kiln Clubs. Meeting8
- Fruit -- Diseases and pests -- Control -- Columbia River Valley7
- Pesticides -- Application -- Columbia River Valley7
- Spraying and dusting in agriculture -- Columbia River Valley7
- Apples -- Diseases and pests -- Control -- Columbia River Valley5
- Cherry -- Diseases and pests -- Control -- Columbia River Valley5
- Cherry -- Diseases and pests -- Control -- Oregon -- Willamette River Valley5
- Pear -- Diseases and pests -- Control -- Columbia River Valley5
- Beans -- Varieties4
- Beets -- Diseases and pests -- Control -- Oregon4
- Beets -- Diseases and pests -- Nutritional aspects -- Oregon4
- Soil fertility -- Oregon4
- Soils -- Oregon -- Willamette River Valley4
- Apples -- Diseases and pests -- Control -- Oregon -- Willamette River Valley3
- Barred owl -- Reproduction3