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Subject
- Geology6
- Land use, Rural4
- Oil wells3
- Petroleum3
- Gas wells2
- Indians of North America2
- Mines and mineral resources2
- Natural gas2
- Cities and towns1
- Geology, Stratigraphic1
- Geology, Structural1
- Geomagnetism1
- Glacial landforms1
- Highway planning1
- Indian land transfers1
- Land tenure1
- Maps1
- Oil well logging1
- Physiographic provinces1
- Precambrian Geologic Period1
