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Subject
- Railroads6
- Maps5
- Administrative and political divisions2
- Coal mines and mining2
- Iron industry and trade2
- Roads2
- Steel industry and trade2
- Agricultural geography1
- Agriculture1
- Aids to air navigation1
- Air travel1
- Boundaries1
- Caves1
- Concentration camps1
- Forests and forestry1
- Freight1
- Highway departments1
- Land use, Rural1
- Nazis1
- Population density1
