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- Mountains--Oregon 36
- Rivers--Oregon 28
- Agriculture 20
- Coasts--Oregon 20
- Indians of North America 20
- Lakes--Oregon 20
- Fishing 17
- Waterfalls 16
- Formations (Geology) 14
- Roads 14
- Pendleton Round-Up 13
- Bridges 12
- Capitols 12
- Boats 11
- Portraits 10
- Bays 8
- Footbridges 7
- Forests and forestry 7
- Islands--Oregon 7
- Tipis 7