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Subject
Boundaries
15
Administrative and political divisions
12
Inland Waters
11
Geoscientific Information
10
Transportation
9
Geomagnetism
8
Counties
7
Society
7
Drainage
6
Environment
6
Hydrography
5
Hydrology
5
Roads
5
Biology and Ecology
4
Cities and towns
4
States
4
Highways
3
Location
3
Metropolitan areas
3
Protected areas
3