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Amgueddfa Cymru – Museum Wales
O.S. map Monmouth Sheet X, Glamorgan Sheet VI Showing Abercanaid, Cwm, Cwm Glo, Brynbach, New Duffryn, Twyn Carno, Old Duffryn, Nantllesg, Pantywaun, Clynmil and Bargoed Collieries and Gethin Pits No.1 & 2. Also Plymouth Ironworks, Pentrebach Oronworks, Penydarren Ironworks, Cyfarthfa Ironworks, Dowlais Ivor Ironworks, Dowlais Ironworks, Rhumney Ironworks, Duffryn Ironworks and Ynysfach Ironworks, also Rhumney Brick and Tile Works, 1885
