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A letter and a schedule. The letter is typed in black ink on cream paper. The schedule is typed in black ink on white paper. A letter and schedule from E.I.David to J.O Pearce of Messrs. Ewbank and Partners, regarding the cooling water temperature and vaccum at Middle Duffryn Power Station. Loose within pink/peach card file with other documents relating to Middle Duffryn and Bargoed High Pressure Station.
