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Subject
- Land use, Rural79
- Mines and mineral resources29
- Geology15
- Roads10
- Land use8
- Ocean bottom6
- Geology, Structural5
- Administrative and political divisions4
- Geology, Stratigraphic4
- History4
- Outdoor recreation4
- Phytogeography4
- Water table4
- Earthquakes3
- Groundwater3
- Navigation3
- Population3
- Public lands3
- Aquifers2
- Central business districts2
