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Amgueddfa Cymru – Museum Wales
Ordnance Survey map composite (photocopy) (not dated) Nantle : Drws y Coed Copper Mine, Simdde Dylluan Copper Mine. Beddgelert : Bwlch y Ddwy Elor slate Quarry, Ddol Ifan Gethin Slate Quarry, Cwm Dwyfawr Copper Mine, Gilfach Copper Mines, Moel Hebog Copper Mine Scale - 6" to 1 mile
