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Coal mines and mining --- Coal mines and mining --- Mine ventilation --- Mine explosions --- Mineral dusts --- Dust control --- Safety measures. --- Equipment and supplies. --- Prevention.
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Coal mines and mining --- Coal mines and mining --- Mine ventilation --- Mine explosions --- Mineral dusts --- Coal mines and mining --- Mine explosions --- Mine ventilation --- Mineral dusts. --- Dust control --- Safety measures. --- Equipment and supplies. --- Prevention. --- Safety measures. --- Prevention. --- Equipment and supplies.
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Mine ventilation --- Mine explosions --- Equipment and supplies. --- Prevention.
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Mine ventilation --- Mine explosions --- Equipment and supplies. --- Prevention.
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