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- Rivers 200
- Explorers 187
- Discovery and exploration 148
- Canada, Western 108
- Bodies of water 101
- Photography 92
- West (U.S.) 54
- Inland navigation 40
- Rapids 38
- Boats and boating 24
- Discoveries in geography 21
- Railroads 18
- Canals 10
- Eddies 10
- Boatbuilding 7
- Steamboats 7
- Maps 5
- River surveys 5
- Salmon 4
- Dams--Surveying 3
