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Eighteenth-century letters and papers, 1705-1887, of both branches of the Parsons family, but almost all of them deriving from the Parsonses of Parsonstown - excluding the papers of Sir Laurence Parsons, 5th Baronet, later 2nd Earle of Rosse, which constitute Sections C-F.

Correspondence of the 3rd and 4th Earls of Rosse with fellow-astronomers or about the Birr and other observatories, including correspondence of the 5th and 6th Earls about the Birr Observatory, 1840-1909, 1913-14, 1938 and 1964-84.

T.C.D. exercise book [of the 4th Earl?] on ancient and British history, with related printed papers, and the 4th Earl’s degree in Physics.

King’s County and Co. Tipperary commissions of the peace for Lord Oxmantown, subsequently the 4th Earl.