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Hydrographic surveying
3
Parks
3
Quality
3
Quality control
3
Recreation areas
3
Aqueducts
2
Communication
2
Contours (Cartography)
2
Demography
2
Electric lines
2
Geysers
2
Harbors
2
Hot springs
2
Human settlements
2
Hydrographic structures
2
Industrial sites
2
Lakes
2
Marshes
2
Mines and mineral resources
2
Oil storage tanks
2