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Handwritten in pencil and blue ink on off-white, blue ruled paper. Two pages held together with a paperclip. Includes notes and sketches relating to Cefn Coed Colliery. The first page is dated 7-12-33 and the second page is dated 16-3-33. 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'.
