Subject
- Agricultural pests -- Control -- Congresses383
- Fisheries -- Oregon245
- Game and game-birds -- Oregon237
- Game protection -- Oregon235
- Oregon State University -- Curricula228
- Fisheries -- Economic aspects -- Congresses133
- Forests and forestry -- Oregon132
- Wildlife management -- Oregon124
- Herbicides119
- Fishing -- Oregon108
- Hunting -- Oregon107
- 4-H clubs91
- Sustainable fisheries -- Congresses87
- Forests and forestry -- Research -- Oregon76
- U.S. International Biological Program. Coniferous Forest Biome76
- Douglas fir74
- Forests and forestry -- Northwest, Pacific73
- Oregon State University. College of Forestry72
- Reforestation -- Oregon66
- Industrial arts -- Study and teaching65