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Aqueducts
2
Communication
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Contours (Cartography)
2
Demography
2
Electric lines
2
Electric power transmission
2
Human settlements
2
Hydrographic surveying
2
Hydrography
2
Lakes
2
Marine accidents
2
Marshes
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Mines and mineral resources
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Navigation
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Population
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Racetracks
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Railroads
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Reefs
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Reservoirs
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Roads
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