Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Questionnaire on furnace burdens
Typed in black ink on white paper. A table containing data, with the title "Questionnaire on furnace burdens. Classification of burden consituents".
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.