Westminster Mine: Ordnance Survey 25-inch Denbighshire sheet XX.6 (Erryrys area) showing veins, line of Nant Adda level, etc.
B3/6 part.
Westminster Mine: Ordnance Survey 25-inch Denbighshire sheet XX.6 (Erryrys area) showing veins, line of Nant Adda level, etc.
B3/6 part.
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