学科
- Fisheries -- Oregon188
- Game and game-birds -- Oregon187
- Game protection -- Oregon187
- 4-H clubs172
- Agriculture -- Oregon108
- Agriculture73
- Wildlife management -- Oregon70
- Fishing -- Oregon59
- Hunting -- Oregon59
- Forests and forestry -- Oregon56
- Douglas fir55
- Herbicides52
- Forests and forestry -- Northwest, Pacific40
- Forests and forestry -- Research -- Oregon37
- Reforestation -- Oregon37
- Soils -- Oregon36
- Cattle -- Feeding and feeds33
- Engineering33
- Wheat32
- Swine -- Feeding and feeds26