Subject
- Fertilizers -- Oregon5
- Fish culture -- Oregon5
- Poultry -- Housing5
- Fisheries -- Oregon4
- Fungicides -- Analysis3
- Insecticides -- Analysis3
- Apple -- Diseases and pests -- Control -- Oregon2
- Borers (Insects) -- Oregon2
- Drainage -- Oregon -- Willamette River Valley2
- Forests and forestry -- United States2
- Forests and forestry -- Vocational guidance2
- Peach -- Diseases and pests -- Oregon2
- Prune -- Diseases and pests -- Oregon2
- Sheep -- Economic aspects -- Oregon2
- Soil moisture -- Oregon -- Willamette River Valley2
- Waterlogging (Soils) -- Oregon -- Willamette River Valley2
- Wheat -- Diseases and pests -- Oregon2
- Agricultural experiment stations1
- Alfalfa -- Processing -- Machinery1
- Apple -- Diseases and pests -- Oregon1