Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
The Northumberland Coalfield (leaflet)
Content summary - information on the history, reserves and prospects of the Northumberland coalfield. One sheet folded. Yellow cover. Undated.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.