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Subject
- Land use, Rural78
- Geology31
- Mines and mineral resources23
- Roads16
- Geology, Structural13
- Administrative and political divisions10
- Aquifers10
- Ocean bottom9
- Water table6
- World maps6
- Geology, Stratigraphic4
- Land use4
- Marine sediments4
- Deserts3
- Groundwater3
- Hydrogeology3
- Navigation3
- Population3
- Faults (Geology)2
- Forest ecology2
