Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
South Wales Coal Field, Monmouthshire, plan
South Wales Coal Field Vertical Sections by Henry K Jordan F.G.S South Wales Institute of Engineers 1908 (Copyright) scale 100 feet to one inch
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.