Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
South Wales Coal Field Vertical Sections, plan
Plan by Henry K. Jordan F.G.S, South Wales Institute of Engineers, 1908. Scale 100 feet to one inch. Swansea and Neath District, Tondu District, Ogmore-Fach District, Monmouthshire Pen-Y-Fan District, Forest of Dean.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.