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Amgueddfa Cymru – Museum Wales
Typed in purple ink on cream paper. Some details handwritten in pencil. A letter adressed to Edmunf L.Hann of Aberaman, regarding the power consumption of collieries in the Aberdare Valley. Three pages stapled together. The third page contains a list of units consumed per colliery for the month of February, 1922. Letter dated 24th April, 1922. Loose within a beige/light brown file with all other documents with the accession number 83.184I/70. The file is labeled 'Steam and Electric Collieries'.