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Amgueddfa Cymru – Museum Wales
Electrical Review, Friday 26th Feb 1960, Vol 166 No.9 (pp.367-398). Pp. 381-393 contain an article re. Ffestiniog pumped storage scheme. Also two pages from Electrical Review (August 16th, 1963 pp. 231-234) with an article re. Ffestiniog pumped storage scheme.
