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coal mining safety better but still perilous

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Coal mining safety: Better but still perilous Apr. 8, 2010

Coal mining safety: Better but still perilous Apr. 8, 2010

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Coal mining safety: Better but still perilous Apr. 8, 2010

Coal mining safety: Better but still perilous Apr. 8, 2010

As this week's disaster in West ia proved, coal mining is still a dangerous job .The mining accident in Upper Big Branch Mine was the worst coal mining disaster ...

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Coal mining safety: Better but still perilous Apr. 8, 2010

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