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Subject
- World War, 1939-194565
- Campaigns46
- Maps38
- World War, 1914-191837
- Military campaigns36
- History29
- Historical geography25
- Administrative and political divisions19
- Geology19
- Cartes10
- Railroads10
- Karte9
- Occupied territories9
- Mines and mineral resources8
- Politics and government8
- Transportation8
- Geology, Stratigraphic7
- Roads7
- Boundaries6
- Population6
