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Amgueddfa Cymru – Museum Wales
Photograph captioned ''Penyrorsedd Slate Quarry in the Nantlle Valley. The steep sides of the terraces cut into the face of the mountain and the wooden ladders used for descent and ascent indicate that 'winning' slate was often a perilous occupation.'' Mounted on card. Made for the exhibition RECORDING WALES 3 in 1970/1971.
