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Subject
- Groundwater37
- Aquifers29
- Geology, Stratigraphic22
- Outcrops (Geology)8
- Granite7
- Volcanic ash, tuff, etc7
- Granite outcrops6
- Basalt5
- Basalt outcrops5
- Hydrogeology5
- Water chemistry5
- Water-supply5
- Hydrology4
- Sedimentary rocks4
- Water quality4
- Formations (Geology)3
- Stream measurements3
- Breccia2
- Siliceous rocks2
- Water levels2