Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Hook Colliery, plan
Plan: Hook Colliery, Rock, Tumblin, Low, Timber and seams proved below Timber seam. Correct to September 1935.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.