Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
National Coal Board, press release
Press release relating to Trelewis Drift Mine 'being the first mine in Wales ever to advance a coalface by more than 100 feet in a single week'. Dated 17 October 1979. One page.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.