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Amgueddfa Cymru – Museum Wales
Full title: "Disgrifiad O'r Gwaith a Fwriedi'r Ym Mlaenau Ffestiniog Gyda'r Cynllyn I Bwmpio Ac Ystorio Dwr Ar Gyfer Cynhyrchu Trydan" 6-page paper booklet in Welsk. Black print on white paper. 3 illustrations.
