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- Lakes--Oregon 52
- Mountains--Oregon 21
- Forests and forestry 9
- Islands--Oregon 8
- Formations (Geology) 6
- Agriculture 4
- Fishing 4
- Wildlife refuges 4
- Hunting 3
- Lakes--California 3
- Rivers--Oregon 3
- Boats 2
- Burning of land 2
- Chipmunks 2
- Ducks 2
- Land use--Planning 2
- Oregon State Planning Board 2
- Oregon. Advisory Research Council 2
- Osprey 2
- Pelicans 2