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Location
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6
Transportation
4
Harbors
2
Inland Waters
2
Shipping
2
Airports
1
Cable cars (Streetcars)
1
Cities and towns
1
Coasts
1
Coastwise shipping
1
Dams
1
Docks
1
Great Lakes (North America)
1
Hydrography
1
Inland water transportation
1
Local transit
1
Monorails
1
Passenger trains
1
Population
1
Port districts
1