Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Blasting in stone drifts, notes
Thirteen handwritten pages on blasting in the coal industry. Handwritten in black ink on off-white, lined paper. Contains several drawings in pencil and in black ink.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.