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Wages --- Bituminous coal mines and mining --- Coal miners --- United States.
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Coal miners --- Bituminous coal mines and mining --- Wages --- United States.
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Coal miners --- Bituminous coal mines and mining --- Wages --- Bituminous coal mines and mining. --- Coal miners. --- Wages. --- United States.
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Wages --- Wages --- Bituminous coal mines and mining --- Bituminous coal mines and mining. --- Wages. --- Wages --- Coal miners --- Coal miners. --- United States.
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