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Subject
- Geology21
- Geology, Structural7
- Aquifers6
- Mines and mineral resources6
- Groundwater3
- Land use, Rural3
- Administrative and political divisions2
- Biotic communities2
- Continental shelf2
- Earthquakes2
- Ecology2
- Geomorphology2
- Humanitarian assistance2
- Hydrogeology2
- Marble2
- Public lands2
- Wilderness areas2
- World maps2
- AZ1
- Agriculture1
