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Amgueddfa Cymru – Museum Wales
Ordnance Survey map (photocopy) plan SH 5054 - 5154 (1975 ) Nantle : Pen yr Orsedd Slate Quarries, Ellen Slate Quarry, Fron Slate Quarry, Gloddfa Slate Quarry, Glytiau Slate Quarry, Old Braich slate Quarry, Old Cilgwyn Slate Quarry Scale - 1:2500
