Papers of the Hamilton family, Earls, Marquesses and Dukes of Abercorn containing leases, deeds, accounts, maps, rentals, out letters, etc. relating to estates in Cos. Tyrone, Donegal and Londonderry, ca. 1610-1920. In addition to their Irish land holdings, they owned estates near Edinburgh, Scotland, and in London, England. Originally Scottish by race and Catholic by religion, The Abercorns are a distinctively Irish family. They were the highest...

These are the original notebooks used when making valuations of property. They are basically arranged by county, then alphabetically by barony and then parish or townland. Some are out of order. The surveys include maps of the areas surveyed. A printed and indexed compilation of these valuations, known as "General Valuation of Rateable Property in Ireland, 1847-1864" or "Griffith's Valuation" is also available.