Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Snowdon Colliery, plan
Snowdon Colliery, Kent, Ventilation Pressure Survey, East Intake and Return, Oct 1940 and Ventilation Development Plan, East District, 1940/1950
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.