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Subject
- Navigation278
- Harbors127
- Geology122
- Geology, Stratigraphic27
- Mines and mineral resources25
- Aquifers17
- Geology, Structural15
- Groundwater14
- Roads12
- Geomagnetism11
- Wetlands11
- Geochemical prospecting9
- Nautical charts9
- Gravity anomalies8
- Land use8
- Administrative and political divisions7
- Maps7
- Marine sediments7
- Pipelines7
- Fossil fuels6
