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- Rivers 259
- Explorers 179
- Discovery and exploration 138
- Bodies of water 124
- Photography 103
- Canada, Western 90
- West (U.S.) 79
- Northwest, Pacific 47
- Inland navigation 33
- Rapids 33
- Transportation 27
- Canals--Design and construction--Costs 26
- Water resources development 26
- Dams--Design and construction 25
- Discoveries in geography 22
- Boats and boating 16
- Railroads 14
- Canals 8
- Eddies 8
- Mountains 7