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Subject
- Campaigns35
- World War, 1939-194535
- Military campaigns34
- Railroads4
- Administrative and political divisions2
- Roads2
- Aeronautics, Commercial1
- Coal mines and mining1
- Drainage1
- Electric power distribution1
- Electric power-plants1
- Europe1
- Forests and forestry1
- Iron industry and trade1
- Land use1
- Language and languages1
- Languages1
- Military aspects1
- Phytogeography1
- Population1
