Correspondence relating to O'Curry's work with the Ordnance Survey and the Royal Irish Academy and general correspondence on antiquarian, genealogical, linguistic and literary matters; correspondence as Professor of Archaeology and Ancient Irish History in the Catholic University, mainly concerning his academic and research interests; some personal correspondence, and personal financial and family documents.

Letters from correspondents primarily in the British Isles, but also from North America and the Middle East, encompassing a wide range of antiquarian concerns including archaeological finds, anatomy, sigillography, topography, numismatics, and Frazer's collection of autographs and prints.

A selection of manuscript material from the Irish Dialect Archive (Cartlann na gCanúintí) of the School of Irish, Celtic Studies, Irish Folklore and Linguistics at UCD.

Two pamphlets relating to the proposed move of UCD to Belfield.