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Subject
- Geology43
- Navigation18
- Physical geography17
- Harbors16
- Nautical charts12
- Petroleum shipping terminals4
- Intrusions (Geology)3
- Boundaries2
- Remote-sensing maps2
- Administrative and political divisions1
- Economic conditions1
- Geomorphology1
- Mines and mineral resources1
- Oil fields1
- Population1
- Rocks, Ultrabasic1
- Transportation1
- Travel1
- Tribes1
- Volcanic ash, tuff, etc1
