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Four types of coal are:
Four types of coal are:
* Anthracite - the cleanest burning coal, found in such regions as south [[Wales]] and northeast [[Pennsylvania]].
* [[Anthracite]] - the cleanest burning coal, found in such regions as south [[Wales]] and northeast [[Pennsylvania]].
* Bituminous coal - widely found in [[Appalachia]] and widely used, and does not burn as cleanly as anthracite.
* Bituminous coal - widely found in [[Appalachia]] and widely used, and does not burn as cleanly as anthracite.