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Topic
- Columbia River 17
- Rapids 15
- Waterfalls 14
- Oregon, Eastern 13
- Railroad stations 11
- Columbia River Watershed 8
- River engineering 8
- United States--Appropriations and expenditures 8
- River surveys 7
- Cities and towns 6
- Dinghies 6
- Flags 6
- Floods 6
- Inauguration 6
- Spectators 6
- Speeches, addresses, etc., American 6
- Landscape photography 5
- West (U.S.) 5
- Bodies of water 4
- Canals--Design and construction--Costs 4