Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
East Moors works blast furnace department, notes
Calculation of Limestone Factor Monti Iron Ore (Low Phosphorus South Spain) Handwritten in blue biro on cream, lined paper.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.