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Amgueddfa Cymru – Museum Wales
Printed in black ink on off-white paper. National Coal Board S.W. Division Area No.9. Abernant Colliery Typical Seam Sections for Big Vein, Black Vein, Peacock Vein, Brynlloi Vein, Middle Vein, Lower Vein. Scale : 1" to 1 foot Dated 13.10.54.
