Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
South Wales Coal Field, Monmouthshire, plan
South Wales Coal Field. Monmouthshire Area Horizontal Section - Rhymney to Cwmbran by Henry K Jordan F.G.S Natural Scale 880 feet = 1 inch. South Wales Institute of Engineers 1908 (copyright)
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.