Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
East Moors Works, report
Single page, typed in black ink on cream paper. Results of tests on the "Atlas" hand made firebrick. Dated 28/6/51.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.