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- Wagons 13
- Formations (Geology) 11
- Waterfalls 10
- Caves 9
- Photographers 9
- Rivers--Oregon 9
- Mountains--Oregon 7
- Agriculture 6
- Basalt 6
- Portraits, Group 6
- Forests and forestry 5
- Mountaineering 5
- Portraits 4
- Bakeries 3
- Children 3
- Glaciers 3
- Indians of North America 3
- Mountains--Washington (State) 3
- Volcanic ash, tuff, etc 3
- Bridges 2