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Subject
- United States. Congress. House13
- Atlases9
- Election districts9
- Geology, Stratigraphic7
- Stratigraphic correlation6
- Census districts3
- Early maps3
- Geology3
- Historical geography3
- Oil-shales3
- Roads3
- United States. Congress3
- Bible2
- Formations (Geology)2
- Geography2
- Gravity anomalies2
- Groundwater2
- Human geography2
- Physical geography2
- Ptolemy, active 2nd century2