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Coal mining | Britannica.com
India: Govt plans big push to pvt coal mining, underground coal
Most coal plants in the US contaminate groundwater with toxins - report
mining - Kids | Britannica Kids | Homework Help
Coal mining - Underground mining | Britannica
Typical underground mine infrastructures and accesses (Atlas Copco
Coal Mining, Kentucky Geological Survey, University of Kentucky
Prasindo Consulting: Coal is mined by two methods – surface or
Coal mining - encyclopedia article - Citizendium
