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Amgueddfa Cymru – Museum Wales
Ordnance Survey map (photocopy) Sheet SH 55, (1953) Nantle : Alexandra Slate Quarry, Braich Slate Quarry, Fron Slate Quarry, Moel Tryfan Slate quarries, Pen y Bryn Slate Quarries, Pen yr Orsedd Slate Quarries, Drws y Coed Copper Mine, Beddgelert, Glenrafon Slate Quarries Scale - 1:25000
