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Topic
- Photography 15
- River engineering 15
- Northwest, Pacific 14
- United States--Appropriations and expenditures 13
- Rivers 10
- Nature 8
- Travel 8
- Bodies of water 6
- River surveys 6
- Scenic byways 5
- West (U.S.) 4
- Canals--Design and construction--Costs 3
- History 3
- Jetties 3
- Railroad engineering 3
- Tourism 3
- Dams--Design and construction 2
- Explorers 2
- Mountains 2
- Northwest, Pacific--History 2