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Amgueddfa Cymru – Museum Wales
Handwritten in pencil on off-white paper. Eight indicator cards and a piece of note paper with details relating to the indicator cards. Indicator cards numbered 1-4 and 9-12 for the Markham winding engine, Cefn Coed Colliery. The cards are dated from 10/7/34 and 11/7/34, and the note is dated 2/8/34. Loose within a green card file labelled 'Colliery Boiler Plant B31', 'Cefn Coed Data' and 'Colliery Engineering'.
