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Subject
- Geology35
- Real property18
- Land use, Rural15
- Cartes12
- GeĢologie11
- Railroads9
- Mines and mineral resources8
- Description and travel7
- Geology, Structural7
- Groundwater7
- Geomagnetism5
- Landowners5
- Geology, Stratigraphic4
- Indians of North America4
- Motor vehicles4
- Indian allotments3
- Land tenure3
- Oil wells3
- Petroleum3
- Administrative and political divisions2
