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Amgueddfa Cymru – Museum Wales
O.S. map Monmouth Sheet VI.16 Showing Rhymney Ironworks, Terrace Pit, Maerdy Pit, New Duffryn Pit, Old Diuffryn Pit, Twyn Carno Pit, Gwaun Fawr Pit and Gwrhyd Pit, 1877 Scale : 1:2500
