Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Application of the Schwartz-Holywell Stower at Merthyr Vale Colliery (report)
Mining Bulletin No.3. Seven pages with additional pages of original photographs and tables, diagrams.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.