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Amgueddfa Cymru – Museum Wales
Printed in black ink on off-white paper. Some parts of the plan are drawn/highlighted in pencil and red ink. National Coal Board S.W. Division Area No.9. Diagrammatic arrangement of main electrical distribution and supply for underground, Abernant Colliery. Sheet 1 of 2 : Main substations and district feeders. Dated 25-7-55.
