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- Conservation of natural resources 4
- Game and game-birds 2
- Oregon State Planning Council 2
- Wildlife management 2
- Agriculture 1
- Bodies of water 1
- Burning of land 1
- Conservation of natural resources--Law and legislation 1
- Forests and forestry 1
- Fur-bearing animals 1
- Geological Survey (U.S.) 1
- Groundwater 1
- Industrialization 1
- Izaak Walton League of America 1
- Lakes--Oregon 1
- Land use--Planning 1
- Landscape protection 1
- Midge 1
- National parks and reserves 1
- Natural areas 1
