Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Report
Five pages stapled together. Title: 'National Federation of Iron & Steel Manufacturers: Concentration of Northants Ore by Washing & Screening' Laboratory tests carried out by Lloyds Ironstone Co. Ltd. Dated 9th June, 1931.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.