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- Discovery and exploration 151
- Rivers 138
- Explorers 135
- Canada, Western 76
- Bodies of water 58
- Photography 47
- West (U.S.) 29
- Rapids 18
- Discoveries in geography 17
- Inland navigation 16
- Boats and boating 15
- Railroads 10
- Eddies 5
- Maps 4
- Boatbuilding 2
- Mosquitoes 2
- River surveys 2
- Salmon 2
- Dams--Surveying 1
- Discovery & exploration 1
