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Subject
- Campaigns18
- World War, 1939-194518
- Military campaigns17
- Railroads10
- Roads7
- Maps5
- Transportation4
- Administrative and political divisions2
- Harbors2
- Languages2
- Population2
- Population density2
- Radio stations2
- Aids to air navigation1
- Boundaries1
- Coal mines and mining1
- Communications1
- Concentration camps1
- Europe1
- Forests and forestry1
