Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
The Ignition of Firedamp by Friction (report)
Safety in Mines Research Establishment Report No. 42. 23 pages, stapled.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.
Amgueddfa Cymru
Safety in Mines Research Establishment Report No. 42. 23 pages, stapled.