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OS200
A Digital Archive of Ireland's Ordnance Survey
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OS Maps
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County Londonderry
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1830 - 1851
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1.
Ordnance Survey 1st Edition 6-inch Map Sheet Information. County Derry/Londonderry Sheet 13.
2.
Ordnance Survey 1st Edition 6-inch Map Sheet Information. County Derry/Londonderry Sheet 7.
