Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
A New Silicious Filling Material (article)
Reprint from the "Chemical Trade Journal and Chemical Engineer", November 8, 1919. Printed on ons side of sheet of paper. Content summary - Value of 'waste' products, mentions the North Wales Development Co.Ltd. and its powdered slate marketed under the name of "Myrtox"
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.