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Amgueddfa Cymru – Museum Wales
Printed in black ink on white paper. Some details have been colour coded with green, yellow, green and red coloured pencil. There is a key in the bottom left hand corner. National Coal Board S.W. Division Area No.9. Cwmgorse Colliery. Plan of new sinkings -isometric drawing of proposed underground layout. Scale : 1:2500 Dated 8.6.53.
