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- Explorers 436
- Discovery and exploration 366
- Rivers 182
- Canada, Western 93
- Bodies of water 88
- Photography 75
- West (U.S.) 46
- Rapids 39
- Inland navigation 23
- Discoveries in geography 18
- Boats and boating 17
- Railroads 13
- Eddies 9
- Northwest, Pacific 9
- Canals 7
- Steamboats 7
- Maps 6
- Glaciers 4
- Ice caves 4
- Mountains 4
