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OS200
A Digital Archive of Ireland's Ordnance Survey
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Creator
O'Donovan, John
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Irish/Gaeilge
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Dates
1835
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1.
Index to Ordnance Survey Letters for Counties Armagh and Monaghan (No. 1-30)
2.
Ordnance Survey Letters for Counties Armagh and Monaghan: No. 19.
