Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
South Wales coalfield, map
Map of South Wales Coalfield showing collieries supplying coal to gas works; coal survey laboratory, Cardiff July 1941 (Ex Powell Duffryn House)
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.