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Subject
- Real property12
- Geology8
- Geomagnetism5
- Land use, Rural4
- Indians of North America3
- Landowners3
- Mines and mineral resources3
- Oil wells3
- Petroleum3
- Description and travel2
- Gas wells2
- Land tenure2
- Natural gas2
- Railroads2
- Agriculture1
- Cities and towns1
- Dakota Indians1
- Economic conditions1
- Geology, Stratigraphic1
- Geology, Structural1
