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Coal - Wikipedia
Coal | Properties, Formation, Occurrence and Uses
Coal: Anthracite, Bituminous, Coke, Pictures, Formation, Uses
Coal explained - U.S. Energy Information Administration (EIA)
Coal - Carbon, Organic Matter, Sedimentary Rock | Britannica
Coal | Uses, Types, Pollution, & Facts | Britannica
Coal in a Nutshell - ThoughtCo