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Subject
Boundaries
14
Wetlands
12
Environment
9
Quality
8
Quality control
8
Hydrology
7
Administrative and political divisions
6
Coasts
6
Lakes
6
Marshes
6
Reservoirs
6
Swamps
6
Trees
6
Vegetation boundaries
6
Vegetation classification
6
Water
6
Cities and towns
4
Location
4
Mines and mineral resources
3
Salt mines and mining
3