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- Oregon. State Game Commission 10
- Oregon Wildlife Federation 5
- Rivers--Oregon 3
- Conservation of natural resources 2
- Agriculture 1
- Burning of land 1
- Conservation of natural resources--Law and legislation 1
- Conservation of natural resources--Study and teaching 1
- Dams 1
- Deers 1
- Forests and forestry 1
- Game and game-birds 1
- Geological Survey (U.S.) 1
- Groundwater 1
- Izaak Walton League of America 1
- Lakes--Oregon 1
- Land use--Planning 1
- Lectures and lecturing 1
- Midge 1
- Oregon State Agricultural College 1
