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Topic
- Architecture, American 197
- Architecture--United States 196
- Columbia River 24
- Rapids 16
- Waterfalls 14
- Oregon, Eastern 13
- Railroad stations 11
- Rivers 10
- Rivers--Oregon 10
- Cities and towns 9
- Columbia River Watershed 8
- River engineering 8
- United States--Appropriations and expenditures 8
- River surveys 7
- Dams 6
- Dinghies 6
- Flags 6
- Floods 6
- Inauguration 6
- Indians of North America 6
