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- Mountains--Oregon 33
- Rivers--Oregon 23
- Agriculture 18
- Lakes--Oregon 15
- Waterfalls 15
- Bridges 14
- Portraits, Group 13
- Indians of North America 12
- Fishing 10
- Boats 9
- Bays 8
- Coasts--Oregon 8
- Formations (Geology) 8
- Armed Forces 7
- Capitols 7
- Pendleton Round-Up 7
- Roads 7
- Bridges--Design and construction 6
- Footbridges 6
- Forests and forestry 6