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Blueprint. Parts of the diagram are highlighted using green, pink, yellow and brown felt tip pen. 'Diagrammatic Pipe Line Arrangement for The Cefn Coed Colliery, Crynant.' Drawing No 10/21. 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'.
