During the period 1979-2007, Lord and Lady Rosse facilitated many decades of research by A.P.W. Malcomson, former director of the Public Record Office of Northern Ireland, and latterly sponsored by the Irish Manuscripts Commission, to enable the production, for the first time, of a comprehensive Calendar of the Rosse Papers in 2008.
In 1975, he sold the papers of several of his Irish ancestors, including Thomas O'Hagan, 1st Baron O'Hagan, to the Public Record Office of Northern Ireland.
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According to the Introduction to the Dartrey Papers (published by P.R.O.N.I. in Belfast and available to view online), part of the Fairfield Estate, the Corry family's country estate that included Rockcorry, was bought for The 3rd Baron Cremorne (1817-1897), the young head of the Dawson family of neighbouring Dartrey, in 1831.
The papers relating to his official activities are held at Derbyshire Record Office, with copies at the Public Record Office of Northern Ireland.