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Subject
- Land use, Rural78
- Geology30
- Mines and mineral resources22
- Geology, Structural13
- Aquifers10
- Ocean bottom9
- Administrative and political divisions6
- Water table6
- World maps6
- Geology, Stratigraphic4
- Marine sediments4
- Roads4
- Deserts3
- Groundwater3
- Hydrogeology3
- Land use3
- Navigation3
- Forest ecology2
- Forests and forestry2
- Landforms2
