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Amgueddfa Cymru – Museum Wales
Printed in brown ink onto beige coloured paper. Some details typed in red ink. Cefn Coed Colliery at 600,000 ton coal output. Steam flow sheet for the morning shift. Loose within a green card file with all other documents with accession number 83.184I/67. The file is labelled 'Colliery Boiler Plant B31', 'Cefn Coed Data' and 'Colliery Engineering'.
