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OSNI Historical Six-Inch Maps — Edition 1 (1829–1835) source files

The original Six-Inch-to-One-Mile County Series — the first complete topographic survey of Ireland, produced 1829–1835 by the Ordnance Survey. 308 historical map sheets covering all six Northern Ireland counties (Antrim, Armagh, Derry/Londonderry, Down, Fermanagh, Tyrone), engraved at a scale…