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What is the "Coal Vein"?
I've just heard this term, and am almost completely ignorant as to its meaning. What is the defintion of the "coal vein"? Where is it found?
Any information (or a link) about the "coal vein" is appreciated.
I've just heard this term, and am almost completely ignorant as to its meaning. What is the defintion of the "coal vein"? Where is it found?
Any information (or a link) about the "coal vein" is appreciated.