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Amgueddfa Cymru – Museum Wales
Printed in black ink on off-white paper. Two graphs charting steam curves at Cefn Coed Colliery. The chart is dated 9-7-30. 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'.
