Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Wales Gas Board, slide
Diagram titled "Operation North Sea Gas. Natural Gas Transmission in Wales '69".
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.
Amgueddfa Cymru
Diagram titled "Operation North Sea Gas. Natural Gas Transmission in Wales '69".