Subject
- Fisheries -- Oregon14
- Game and game-birds -- Oregon12
- Game protection -- Oregon11
- Forests and forestry -- Northwest, Pacific10
- Engineering -- Research -- Oregon7
- Oceanography -- Research7
- Forests and forestry -- Research -- Northwest, Pacific6
- Pacific Northwest Forest and Range Experiment Station (Portland, Or.)6
- Fish culture -- Oregon5
- Highway research -- Congresses5
- Natural resources -- Oregon5
- Columbia River4
- Forest management -- Oregon4
- Radioactive pollution of water -- Columbia River4
- Radioecology -- Columbia River4
- Road construction -- Congresses4
- Oregon State University. School of Engineering3
- Regional planning -- Oregon3
- United States. Forest Service. Pacific Northwest Region3
- United States. Forest Service. Pacific Northwest Region. Thirty Year Club3