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The Epic Interactive Encyclopedia 1998
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Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso
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Coal_mining
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1992-09-04
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Coal mining is an extraction of coal (a
sedimentary rock) from the Earth's crust.
Coal mines may be opencast, adit, or
deepcast. The least expensive is opencast but
this results in scars on the landscape.
See also OPENCAST_MINING
Subject by: Simone Bennett