Memoranda and papers concerning the Ordnance Survey, with correspondence dealing with County Londonderry, especially the parish of Templemore and the fort of Aileach. Correspondents include Mr. Beaufort, Crofton Croker and Petrie Weale,

1835-1887.
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100 1 |a Larcom, Thomas A.  |q (Thomas Aiskew),  |d 1801-1879 
245 1 0 |a Memoranda and papers concerning the Ordnance Survey, with correspondence dealing with County Londonderry, especially the parish of Templemore and the fort of Aileach. Correspondents include Mr. Beaufort, Crofton Croker and Petrie Weale,  |f 1835-1887. 
351 |c Sub-fond 
540 |a Reproduction rights owned by the National Library of Ireland. 
600 1 0 |a Larcom, Thomas A.  |q (Thomas Aiskew),  |d 1801-1879  |v Correspondence 
610 2 0 |a Ordnance Survey (Ireland) 
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651 0 |a Ireland  |x History  |y 1837-1901 
651 0 |a Ireland  |x Politics and government  |y 1837-1901 
773 1 |i In collection:  |t Larcom Papers, 1821-1879.  |w (IeDuNL)255396 
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