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Topic
- Forests and forestry 39
- Roads 10
- Logging 6
- Lumber trade 6
- Rivers--Oregon 4
- Loggers 3
- Trees--Diseases and pests 3
- Water--Pollution 3
- Agriculture 2
- Burning of land 2
- Croplands 2
- Cutover lands 2
- Fishes--Conservation 2
- Izaak Walton League of America 2
- Lakes--Oregon 2
- Land use--Planning 2
- Mules 2
- Oregon State Planning Board 2
- Oregon. Advisory Research Council 2
- Portraits, Group 2
