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Subject
- Geology128
- Groundwater47
- Aquifers23
- Geology, Stratigraphic21
- Forest management19
- Sediments (Geology)18
- Geochemical prospecting17
- Geology, Structural16
- Mines and mineral resources16
- Water quality14
- Administrative and political divisions13
- Gravity anomalies13
- Geophysics10
- Forest reserves9
- Maps9
- Ore deposits8
- Coal7
- Deserts7
- Geomagnetism7
- Cartes6
