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- Oregon State Agricultural College 7
- College campuses 3
- Conservation of natural resources 2
- Game and game-birds 2
- Hill, D. D. (Donald David), 1894- 2
- Milbrath, John A., 1909- 2
- Oregon State Planning Board 2
- Oregon State University 2
- Wildlife management 2
- Agriculture 1
- Burning of land 1
- Conservation of natural resources--Law and legislation 1
- Forests and forestry 1
- Geological Survey (U.S.) 1
- Groundwater 1
- Izaak Walton League of America 1
- Lakes--Oregon 1
- Land use--Planning 1
- Midge 1
- Oregon State College Speech Department 1
