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- Rivers 348
- Bodies of water 276
- Rivers--Oregon 253
- Northwest, Pacific 221
- Explorers 192
- West (U.S.) 180
- Photography 178
- River engineering 167
- Discovery and exploration 151
- Dams 149
- Rivers--Washington (State) 108
- Canada, Western 106
- United States--Appropriations and expenditures 81
- Waterfalls 72
- Fishing 68
- Salmon 67
- River surveys 54
- Railroad engineering 50
- Canals--Design and construction--Costs 40
- Inland navigation 40