Subject
- Wildlife management -- Oregon144
- Fishing -- Oregon132
- Hunting -- Oregon132
- Game and game-birds -- Oregon98
- Game protection -- Oregon97
- Forests and forestry -- Oregon96
- Fisheries -- Oregon88
- Oregon State University. College of Forestry76
- Forests and forestry -- Research -- Oregon74
- Forests and forestry -- Northwest, Pacific66
- Reforestation -- Oregon52
- Agricultural pests -- Control -- Congresses26
- Forests and forestry -- Research -- Northwest, Pacific26
- United States. Forest Service. Pacific Northwest Region26
- United States. Forest Service. Pacific Northwest Region. Thirty Year Club26
- Pacific Northwest Forest and Range Experiment Station (Portland, Or.)23
- Fishery management -- Oregon -- Statistics22
- Columbia Basin Agricultural Research Center -- Periodicals21
- Fish-culture -- Oregon -- Statistics21
- Fishing -- Oregon -- Statistics21