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Subject
Boundaries
7
Transportation
7
Elevation
5
Topographic maps
5
Quality
4
Quality control
4
Airports
3
Mines and mineral resources
3
Salt mines and mining
3
Administrative and political divisions
2
Cities and towns
2
Coasts
2
Environment
2
Glaciers
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Hydrology
2
Ice
2
Ice sheets
2
Industrial sites
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Location
2
Rapids
2