Subject
- Reforestation -- Oregon31
- Forests and forestry -- Research -- Oregon30
- Agriculture -- Oregon -- Statistics19
- Catalogs, Publishers' -- Oregon19
- College publications -- Oregon19
- Farm produce -- Oregon -- Statistics17
- Agricultural estimating and reporting -- Oregon16
- 4-H clubs14
- Vegetables -- Varieties -- Oregon -- Evaluation8
- Fruit -- Diseases and pests -- Control -- Columbia River Valley7
- Pesticides -- Application -- Columbia River Valley7
- Spraying and dusting in agriculture -- Columbia River Valley7
- Vegetables -- Varieties -- Oregon -- Field experiments7
- Apples -- Diseases and pests -- Control -- Columbia River Valley5
- Cherry -- Diseases and pests -- Control -- Columbia River Valley5
- Forests and forestry -- Measurement5
- Pear -- Diseases and pests -- Control -- Columbia River Valley5
- Spraying and dusting in agriculture -- Oregon5
- Agricultural pests -- Control -- Oregon -- Willamette River Valley4
- Christmas tree growing -- Northwest, Pacific4