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Amgueddfa Cymru – Museum Wales
Ordnance Survey map section (photocopy) Sheet 23/50 Dinorwic Slate Quarries, Vivian Slate Quarry, Ffridd Glyn Slate Quarry, Cook slate Quarry, Ddol slate Quarry, Glyn Rhonwy Slate Quarry (Llanberis) Scale - 1:25000 3 copies
