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Subject
- Geology474
- Groundwater316
- Aquifers216
- Roads184
- Harbors165
- Geology, Stratigraphic118
- Geology, Structural87
- Census districts60
- Mines and mineral resources56
- Water table54
- Hydrogeology49
- Water quality41
- Water-supply34
- Atlases33
- Hydrology29
- Submarine topography25
- Faults (Geology)24
- World maps24
- Geochemical prospecting22
- Floods21