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Subject
- Geology49
- Administrative and political divisions27
- World War, 1939-194518
- Transportation15
- Topographic maps10
- Federal aid to transportation7
- Occupied territories6
- Campaigns5
- Mines and mineral resources5
- Aeronautical charts4
- Forest reserves4
- Roads4
- Landforms3
- Population3
- Population density3
- Airways2
- Election districts2
- Forests and forestry2
- Germans2
- Maps2
