Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Drainage of Firedamp from Mines (report)
'Report by the Ministry of Fuel and Power and National Coal Board Joint Working Party on the Drainage of Firedamp from Mines'. 83 pages, stapled.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.