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Topic
- Discovery and exploration 5
- Explorers 4
- Rivers 4
- Photography 3
- Rapids 3
- Boats and boating 2
- Canada, Western 2
- Discoveries in geography 2
- Maps 2
- River surveys 2
- Steamboats 2
- Boatbuilding 1
- Bodies of water 1
- Bridges 1
- Canals 1
- Carriages and carts 1
- Cartography 1
- Cities and towns 1
- Cliffs 1
- Dams--Surveying 1
