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Subject
- Railroads12
- Administrative and political divisions2
- Geology2
- Indian reservations2
- Indians of North America2
- Public lands2
- Roads2
- Automobile travel1
- Cities and towns1
- Earthquakes1
- Geology, Stratigraphic1
- Geology, Structural1
- Highway planning1
- History1
- Lutheran Church1
- Paleozoic Geologic Period1
- Sediments (Geology)1
- Shale1
- Soil surveys1
- Soils1
