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Topic
- Columbia River 17
- Rapids 14
- Waterfalls 14
- Oregon, Eastern 13
- Railroad stations 11
- Cities and towns 8
- Columbia River Watershed 8
- Architecture, American 7
- Architecture--United States 7
- Dinghies 6
- Flags 6
- Floods 6
- Inauguration 6
- Indians of North America 6
- Spectators 6
- Speeches, addresses, etc., American 6
- Landscape photography 5
- Bakeries 4
- Chimneys 4
- Iron and steel bridges 4