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Amgueddfa Cymru – Museum Wales
Handwritten in black ink and pencil on white graph paper with printed brown graph lines. Some details highlighted using red and yellow pencil. A graph on the effect of excess dust weight. The years plotted on the graph are 1940 - 1946. Loose within pink/peach card file with other documents relating to Middle Duffryn and Bargoed High Pressure Station.
