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Amgueddfa Cymru – Museum Wales
Ordnance Survey map composite (photocopy) (1953) Nantle : Dorothea Slate Quarry, Alexandra Slate Quarry, Braich Slate Quarry, Pen y Bryn Slate Quarries, Pen yr Orsedd Slate Quarries, Singrig Slate Quarry, Tal y Sarn Slate Quarry, Drws y Coed Copper Mine, Beddgelert, Glanrafon Slate Quarries Scale - 1:2500
