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Subject
- Geology7
- Real property7
- Roads5
- Coal4
- Railroads4
- Indians of North America3
- Landowners3
- Cities and towns2
- Geology, Structural2
- Highway planning2
- Indian land transfers2
- Petroleum2
- Discoveries in geography1
- Discovery and exploration1
- Erosion1
- Gas wells1
- Geology, Stratigraphic1
- GeĢologie1
- Indian reservations1
- Land tenure1
