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Subject
Land use, Rural
52
Minerals
30
Geology
18
Coal
7
Electric power-plants
4
Metropolitan areas
4
Mines and mineral resources
4
Air
3
Economic zoning
3
Express highways
3
Geology, Structural
3
Hydrology
3
Labor supply
3
Mercury
3
Natural gas pipelines
3
Phytogeography
3
Roads
3
Time
3
Aquifers
2
Coal mines and mining
2