Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Graph
Graph drawn in pencil on white, grey lined graph paper. Line graph showing the National System load curve and the typical NCB area load curve. Loose within a beige/light brown file with all other documents with the accession number 83.184I/70. The file is labeled 'Steam and Electric Collieries'.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.