O'Flanagan, M., & Ordnance Survey of Ireland. (1927). Letters containing information relative to the antiquities of the counties of Armagh and Monaghan: Collected during the progress of the Ordnance survey in 1835. s.n..
MLA CitationO'Flanagan, Michael, and Ordnance Survey of Ireland. Letters Containing Information Relative to the Antiquities of the Counties of Armagh and Monaghan: Collected During the Progress of the Ordnance Survey in 1835. s.n., 1927.
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