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- Harbors5
- Navigation5
- Boundaries4
- Maps4
- Land use3
- World War, 1939-19453
- History2
- Industries2
- Nautical charts2
- Population2
- Administrative and political divisions1
- Agricultural geography1
- Campaigns1
- Ethnology1
- Historical geography1
- Languages1
- Military occupation1
- Occupied territories1
- Population density1
- Territorial questions1
