Subject
- Game and game-birds -- Oregon124
- Game protection -- Oregon123
- Fisheries -- Oregon119
- Wildlife management -- Oregon106
- Fishing -- Oregon93
- Hunting -- Oregon93
- Agricultural pests -- Control -- Congresses77
- Forests and forestry -- Oregon67
- Forests and forestry -- Northwest, Pacific62
- Oregon State University. College of Forestry59
- Forests and forestry -- Research -- Oregon54
- 4-H clubs47
- Reforestation -- Oregon39
- Greenhouse gases -- Forecasting26
- Forests and forestry -- Research -- Northwest, Pacific25
- Industrial arts -- Study and teaching25
- United States. Forest Service. Pacific Northwest Region25
- United States. Forest Service. Pacific Northwest Region. Thirty Year Club25
- Columbia Basin Agricultural Research Center -- Periodicals23
- Pacific Northwest Forest and Range Experiment Station (Portland, Or.)22