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Amgueddfa Cymru – Museum Wales
Black print on cream paper with areas highlighted using coloured pens. Map of South and Mid Wales, with areas of South East and East Wales numbered and highlighted with coloured pens, in order to highlight electricity distribution. Key for the type of power line and station in top left (colour key) and key for the electricity distributing authorities in bottom left (number key). Drawing No. E.S. 149
