WALES: Early morning explosion at Gresford Colliery entombed four hundred workers (1934)
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The mining disaster that killed 266 men, 90 years on | This Week In Wrexham
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Why Australia’s Doomed Dam Can’t Be Fixed
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10 Poorest Places in The UK
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Why Coal Breakers were Horrific Places to Work (Coal Breakers Explained)
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Aberfan remembered: Disaster in the Welsh valleys - BBC News
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Inside Britain’s deepest mine
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Upper Big Branch Mine-South Explosion Scenario
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