Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Pneumatic Stowing from the Surface at Crookhall Colliery (booklet)
Information Bulletin No. 56/158. 8 pages, 2 diagrams, 1 table and 2 charts.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.