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- Discovery and exploration 2
- Explorers 2
- Maps 2
- Rapids 2
- Steamboats 2
- Boatbuilding 1
- Boats and boating 1
- Bodies of water 1
- Bridges 1
- Canada, Western 1
- Canals 1
- Carriages and carts 1
- Cartography 1
- Cities and towns 1
- Cliffs 1
- Dams--Surveying 1
- Discoveries in geography 1
- Drawbridges 1
- Eddies 1
- Ferries 1