Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Snowdon Colliery, plan
Snowdon Colliery, Kent, plan of Ventilation Development, South West District. Scale 6ins - 1 mile, 1941/1950
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.