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Subject
- Ethnology1
- Geology, Stratigraphic1
- Gravimetria1
- Languages1
- Mapa geoloĢgico1
- Metropolitan areas1
- Military occupation1
- Occupied territories1
- Ore deposits1
- Permian Geologic Period1
- Population density1
- Prussia, East (Poland and Russia)1
- Stream-gaging stations1
- Streamflow1
- Territorial questions1
- Travel1
- World War, 1914-19181
