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In page Black Country:
"The 20th century saw a decline in coal mining in the Black Country, with the last colliery in the region – Baggeridge Colliery near Sedgley – closing on 2 March 1968, marking the end of an era after some 300 years of mass coal mining in the region, though a small number of open cast mines remained in use for a few years afterwards.[20]
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