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Amgueddfa Cymru – Museum Wales
Six newspaper cuttings relating to the Ffestiniog hydro-electric pumped storage scheme: "Wales to rescue with quick power."; "Welsh hydro power will be on tap."; "Worlds Biggest Battery" article with 1 photo (Western Mail, 9/8/1963); photo of entrance to the Ffestiniog hydro-electric pumped storage scheme; photo of the construction of the dam on the Tryweryn Valley (Western Mail, 24/4/1964); "Nerth Dwr"- article on the scheme written in Welsh, with 1 photo.