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Subject
- Geology177
- Coal124
- Land use, Rural68
- Mines and mineral resources31
- Real property26
- Fire risk assessment20
- Railroads18
- Roads17
- Administrative and political divisions16
- Indian reservations16
- Groundwater14
- Land grants12
- NM12
- Forest reserves11
- Land use9
- Water table8
- Aquifers6
- Public lands6
- Geology, Stratigraphic5
- Geomagnetism5
