Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
The Coalfields of Great Britain (map)
Full title - The Coalfields of Great Britain. Location of the Main Classes of Coal. Black print on white paper, colour used to highlight the different types of coal.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.