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Subject
- Navigation308
- Geology127
- Nautical charts121
- Harbors96
- Groundwater27
- Land use19
- Sediments (Geology)19
- Public lands16
- Aquifers14
- Geology, Stratigraphic12
- Gravity anomalies12
- Coal10
- Hydrogeology10
- Administrative and political divisions8
- Coasts8
- Mines and mineral resources8
- Petroleum shipping terminals8
- Geochemical prospecting5
- Heavy minerals5
- Land tenure5
