Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Colliery Skip Winding (leaflet)
Content summary - the advantages of skip winding in bringing coal from pit bottom to the surface. Printed on four sides of a folded sheet of paper. Undated.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.