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Subject
- Maps13
- Geology9
- Historical geography8
- Campaigns6
- World War, 1914-19186
- Geology, Structural5
- Roads5
- Geology, Stratigraphic4
- Military campaigns4
- Antiquities3
- Gravity anomalies3
- History3
- Administrative and political divisions2
- Boundaries2
- Ecclesiastical geography2
- Plate tectonics2
- Second Coalition, War of the, 1798-18012
- Territorial questions2
- Austro-Prussian War, 18661
- British colonies1
