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Subject
Airports
51
Aqueducts
24
Boundaries
9
Bridges
2
Buildings
24
Chimneys
14
Cities and towns
24
Cliffs
5
Coasts
24
Communication
24
Conveying machinery
1
Cooling towers
14
Dams
11
Demography
24
Electric power transmission
5
Elevation
42
Environment
15
Fault zones
5
Flumes
1
Geophysical prospecting
1