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- Geology6,104
- Groundwater3,462
- Water quality2,451
- Environmental aspects2,049
- Pollution1,501
- Geology, Stratigraphic1,254
- Water1,249
- Mines and mineral resources1,175
- Groundwater flow1,040
- Stream measurements994
- Water-supply984
- Hydrogeology873
- Aquifers783
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- Geology, Structural433