Subject
- Game and game-birds -- Oregon18
- Game protection -- Oregon18
- Columbia Basin Agricultural Research Center -- Periodicals11
- Mineral industries -- Oregon9
- Agriculture -- Research -- Columbia River Watershed7
- Natural gas -- Prospecting -- Oregon7
- Petroleum -- Prospecting -- Oregon7
- Report (United States. Forest Service. Northern Region. Forest Pest Management)7
- Beef cattle -- Oregon -- Congresses5
- Forests and forestry -- Northwest, Pacific5
- Forests and forestry -- Research -- Northwest, Pacific5
- Agriculture -- Research -- Oregon, Central -- Periodicals4
- Field experiments -- Oregon, Central -- Periodicals4
- Pacific Northwest Forest and Range Experiment Station (Portland, Or.)4
- Report (United States. Forest Service. Northern Region. Insect and Disease Management)4
- Bulletin (United States. Division of Entomology)3
- Central Oregon Agricultural Research Center -- Periodicals3
- Earthquakes -- Oregon -- Portland3
- Agricultural experiment stations -- Research -- Oregon -- Klamath County2
- Agriculture -- Research -- Oregon -- Klamath County2