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- Rivers 199
- Explorers 186
- Discovery and exploration 147
- Canada, Western 107
- Bodies of water 100
- Photography 91
- West (U.S.) 53
- Inland navigation 39
- Rapids 37
- Boats and boating 23
- Discoveries in geography 20
- Railroads 17
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- Eddies 9
- Boatbuilding 6
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- River surveys 4
- Explorers 3
- Rivers 3