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Amgueddfa Cymru – Museum Wales
Typed in purple ink on cream paper. Some details have been handwritten in pencil. Twelve pages stapled together. Full title - 'Some Considerations Governing Power Costs at Collieries.' 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'.
