Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Dinorwig Quarries, November 1973 (article)
67 pages with a number of maps and diagrams. Content summary : a report of a survey of the C series of inclines and blondins. In 11 parts.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.