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Amgueddfa Cymru – Museum Wales
O.S. map (copy) Showing Tredegar Ironworks, Tytrist Colliery and Whgitworth Colliery, 1901 Scale : 1:2500
O.S. Map Second edition 1901. Monmouthshire Sheet XI.13. Scale 1/2500 or 25.344 inches to a statute mile or 208.33 feet to an inch - Sian Williams
