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Topic
- Rivers 323
- Bodies of water 276
- Northwest, Pacific 220
- Explorers 192
- West (U.S.) 180
- Photography 178
- River engineering 167
- Discovery and exploration 151
- Canada, Western 106
- United States--Appropriations and expenditures 81
- River surveys 54
- Railroad engineering 50
- Canals--Design and construction--Costs 40
- Inland navigation 40
- Rapids 39
- Transportation 37
- Dams--Design and construction 34
- Riparian areas 32
- Boats and boating 29
- Mountains 28
