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Subject
- Groundwater134
- Rivers102
- Sequence stratigraphy101
- Water quality101
- Geology35
- Geology, Structural21
- Joints (Geology)20
- Water-supply11
- Gravel9
- Sand9
- Geology, Stratigraphic7
- Railroads7
- Roads5
- Sediments (Geology)5
- Glacial landforms4
- Mineral industries4
- Coal3
- Mines and mineral resources3
- Natural gas pipelines3
- Petroleum pipelines3