Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
National Coal Board, press release
Press release titled 'The Mechanisation Drive. Coal Board plan to increase productivity and reduce costs'. Dated 29 March 1961. One page.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.