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Subject
Transportation
4
Airports
2
Petroleum refineries
2
Sewage disposal plants
2
Structure
2
Towers
2
Water treatment plants
2
Aqueducts
1
Boundaries
1
Bridges
1
Buildings
1
Chimneys
1
Cities and towns
1
Coasts
1
Communication
1
Cooling towers
1
Demography
1
Elevation
1
Environment
1
Geysers
1