Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
East Moors Works, report
Single page typed in black ink on cream paper. Title: "Thames shingle and Pendarren (or other) Calcareous silica stone." Report by the chief metallugist, 21st January, 1949.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.