Subject
- Range plants -- Oregon77
- Weeds -- Control33
- Forests and forestry -- Northwest, Pacific31
- Herbicides31
- Columbia Basin Agricultural Research Center -- Periodicals30
- Greenhouse gases -- Forecasting27
- Fish culture -- Oregon25
- Fisheries -- Oregon25
- Forests and forestry -- Research -- Northwest, Pacific25
- U.S. International Biological Program. Coniferous Forest Biome25
- Fishery management -- Oregon -- Statistics23
- Pacific Northwest Forest and Range Experiment Station (Portland, Or.)23
- Fish-culture -- Oregon -- Statistics22
- Fishing -- Oregon -- Statistics22
- Game and game-birds -- Oregon22
- Game protection -- Oregon22
- Agriculture -- Oregon21
- Agriculture -- Research -- Columbia River Watershed21
- Engineering20
- Forests and forestry -- Oregon19