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Subject
- Census districts8
- Roads6
- Harbors5
- Atlases3
- Indigenous peoples of North America3
- Geology2
- Historical geography2
- Physical geography2
- African Americans1
- Geology, Stratigraphic1
- Geomorphology1
- Groundwater1
- Migration, Internal1
- Napoleonic Wars, 1800-18151
- Natural resources1
- Oil-shales1
- Outdoor recreation1
- Paleontology1
- Phytogeography1
- Stratigraphic correlation1