Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Winding in Staple-Pits (booklet)
National Coal Board (Production) Codes and Rules. 20 page booklet in black covers.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.
Amgueddfa Cymru
National Coal Board (Production) Codes and Rules. 20 page booklet in black covers.