Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
National Coal Board, press release
Press release titled 'Mining Coal by Water Power. National Coal Board to experiment with Hydraulic Mining in South Wales'. Dated 23 June 1958. Two pages.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.