Subject
- Fish-culture -- Oregon -- Statistics8
- Fishery management -- Oregon -- Statistics8
- Fishing -- Oregon -- Statistics7
- Fruit -- Diseases and pests -- Control -- Columbia River Valley5
- Pesticides -- Application -- Columbia River Valley5
- Radioactive pollution of water -- Columbia River5
- Radioecology -- Columbia River5
- Spraying and dusting in agriculture -- Columbia River Valley5
- Apples -- Diseases and pests -- Control -- Columbia River Valley3
- Cherry -- Diseases and pests -- Control -- Columbia River Valley3
- Climatic changes -- Oregon -- Evaluation3
- Columbia River3
- Columbia River Estuary (Or. and Wash.)3
- Dissertations, Academic -- Oregon -- Bibliography3
- Pear -- Diseases and pests -- Control -- Columbia River Valley3
- Engineering -- Research -- Oregon2
- Forests and forestry -- Northwest, Pacific2
- Hydrography -- Oregon -- Pacific Coast2
- Land use -- Oregon -- Morrow County -- Planning2
- Land use, Rural -- Oregon -- Morrow County -- Planning2