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Group of 47 quarrymen at Twll y Mwg, Dinorwig Quarry. Two boys are holding a slate with the words ‘Twll y Mwg Oct 10 1921’ written in chalk or paint. Twll y Mwg was one of the ponciau (galleries) at Dinorwig Quarry, located in the Braich section of the quarry (Dinorwig/Deinioled side of the quarry). Photgraph mounted on card.
