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Subject
- Geology31
- Land use, Rural24
- Magnetic anomalies20
- Mines and mineral resources20
- Groundwater14
- Quality14
- Water quality14
- Mining districts9
- Geomagnetism6
- Roads5
- Geology, Structural3
- Mining claims3
- NV3
- Gold mines and mining2
- Railroads2
- Administrative and political divisions1
- Alluvial fans1
- Cartes1
- Cities and towns1
- Conodonts1