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Amgueddfa Cymru – Museum Wales
Handwitten in pencil on off-white, blue ruled paper. Two tables containing compressed air figures for Britannia Colliery, Penallta Colliery and Bargoed. Loose within a beige/light brown file with all other documents with the accession number 83.184I/70. The file is labeled 'Steam and Electric Collieries'.
