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Amgueddfa Cymru – Museum Wales
Ordnance Survey map section (photocopy) Dorothea slate Quarry, Blaen y Cae Slate Quarry, Gallt y Fedw Slate Quarry, Pen y Bryn Slate Quarries and Tal y Sarn Slate Quarry (Nantle) Scale - 1:2500 (not dated)
