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Topic
- Discovery and exploration 153
- Rivers 139
- Explorers 137
- Canada, Western 77
- Bodies of water 59
- Photography 48
- West (U.S.) 30
- Rapids 20
- Discoveries in geography 18
- Inland navigation 17
- Boats and boating 16
- Railroads 11
- Eddies 6
- Maps 6
- Boatbuilding 3
- Mosquitoes 3
- River surveys 3
- Salmon 3
- Steamboats 3
- Dams--Surveying 2
