Subject
- U.S. International Biological Program. Coniferous Forest Biome36
- Columbia Basin Agricultural Research Center -- Periodicals22
- Fishery management -- Oregon -- Statistics22
- Fish-culture -- Oregon -- Statistics21
- Fishing -- Oregon -- Statistics21
- Agriculture -- Research -- Columbia River Watershed17
- Game and game-birds -- Oregon17
- Game protection -- Oregon17
- Mineral industries -- Oregon12
- Report (United States. Forest Service. Northern Region. Insect and Disease Management)12
- Forests and forestry -- Northwest, Pacific10
- Logging -- Machinery10
- Natural gas -- Prospecting -- Oregon10
- Petroleum -- Prospecting -- Oregon10
- Tualatin River Watershed (Or.)10
- Agriculture -- Research -- Oregon, Central -- Periodicals9
- Central Oregon Agricultural Research Center -- Periodicals9
- Field experiments -- Oregon, Central -- Periodicals9
- Forest ecology -- West (U.S.)8
- Bacterial genetics7