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Amgueddfa Cymru – Museum Wales
Ordnance survey map - Monmouthshire sheet XI II Map including Blaina (including the iron works), Pen-y-garn Fach, Nant-y-glo (incl. Nant-y-glo deep pit), Coalbrookvale (incl. Coalbrookvale deep pit). Black print on cream paper. Paper is mounted on a linen backing, with green ribbon trim on top and bottom edges. Map is colour coded in certain areas in blue, pink, orange and brown. Notes written on the map in pencil in some areas. Scale 25.344 inches = 1 mile.
