Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Snowdon Colliery, plan
Snowdon Colliery, Kent, No.2 Pit Ventilation Pressure Survey, South West District, Jan 1941
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.
Amgueddfa Cymru
Snowdon Colliery, Kent, No.2 Pit Ventilation Pressure Survey, South West District, Jan 1941