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- Rivers 311
- Bodies of water 262
- Northwest, Pacific 206
- Explorers 192
- West (U.S.) 180
- Photography 178
- River engineering 166
- Discovery and exploration 151
- Canada, Western 106
- United States--Appropriations and expenditures 80
- River surveys 54
- Railroad engineering 49
- Inland navigation 40
- Canals--Design and construction--Costs 39
- Rapids 39
- Transportation 37
- Dams--Design and construction 34
- Riparian areas 32
- Boats and boating 29
- Mountains 28