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Subject
- Navigation19
- Harbors18
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- World War, 1914-19185
- History4
- Geology, Stratigraphic3
- Geology, Structural3
- Gravity anomalies3
- Administrative and political divisions2
- Plate tectonics2
- Agriculture1
- Airports1
- Boundaries1
- Briefing, Military1
- Campaigns1
- Coasts1
- Early works to 18001
- Ethnology1
- Geomagnetism1
- Historical geography1
