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Amgueddfa Cymru – Museum Wales
O.S. map Glamorgan Sheet XXVII.11 Showing Britannic Merthyr Coal Co.Ltd. Surface ground rents showing Britannic Merthyr, Glamorgan Giofach Goch, Dinas Main, Penygraig, Ely, Dinas Isaf and Upper Penrhiwfer Collieries, 1899 Scale : 1:2500
