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Amgueddfa Cymru – Museum Wales
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Folder containing various N.C.B. memos and minutes relating to Big Pit, Blaenavon Mine, 1965-1976 and a report by N.C.B. South Wales Area Scientific Department titled 'Examination of 26mm Plough Chain Links Failed During Tensioning G9's Face Blaenavon Colliery', 25 September 1978.
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