Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Alexandra Slate Quarry, plan
Hand-drawn, coloured plan and cross section of the Alexandra Slate Quarry. Surveyed by Bowen & Jones, Caernarfon in March 1893. Scale of plan 10 yards to an inch and section 20 yards to an inch.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.