SNIPPET: In Ireland as a prelude to a nationwide valuation of land and buildings, i.e., the so-called Griffith's Valuation, the Ordnance Survey was directed to map the whole country at a scale of six inches to one mile. It was originally intended to accompany each map with written topographical descriptions for every civil parish. The field officers of the Ordnance Survey gathered a wealth of historical and socio-economic information for many parishes in their notebooks before the idea was abandoned in 1840. All the original manuscripts are deposited in 52 boxes in the Royal Irish Academy in Dublin. They cover 19 of Ireland's counties: Cos. Antrim and Londonderry contain by far the most detailed information with 17 and 20 boxes, respectively, of work papers. Cos. Donegal, Down, Fermanagh and Tyrone consist of 2-3 boxes, whereas the remainder, Cos. Armagh, Cavan, Cork, Galway, Leitrim, Leix, Longford, Mayo, Meath, Monaghan, Roscommon, Sligo and Tipperary have only one or part of a box each. Although these memoirs were complied a decade before the Great Famine, emigration was already a very significant demographic feature which was commented on and recorded by the compilers of the memoirs. The memoirs for Cos. Antrim and Londonderry are unique in that for many of their parishes lists of emigrants were compiled for a brief period in the mid-to-late 1830s. As emigration records these lists are unparalleled. These list identify both the destination of the emigrant and the place of emigration, and religious denomination is given for each emigrant named in the memoir. Published in "Irish Emigration Lists 1833-1839," ed. Brian Mitchell, Genealogical Pub. Co., Baltimore, MD, 1989. You should be able to find a copy in your genealogy library.