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Amgueddfa Cymru – Museum Wales
Photograph captioned ''Dorothea Slate Quarry. One of the early quarry workings at one of the many quarries in the Nantlle Valley, Caernarvonshire. The building in the top left-hand corner houses the Cornish-type beam engine which pumped water from the main quarry.'' Mounted on card. Made for the exhibition RECORDING WALES 3 in 1970/1971.
