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Subject
- Geology183
- Magnetic anomalies26
- Mines and mineral resources20
- Geomagnetism13
- Groundwater9
- Coal5
- Geology, Structural5
- Engineering geology4
- Geology, Stratigraphic4
- National parks and reserves4
- Administrative and political divisions3
- Aquifers3
- Lunar geology3
- NV3
- Railroads3
- Roads3
- Satellites3
- Atmospheric temperature2
- Coal mines and mining2
- Floods2
