Textual and visual material consisting mainly of notes, drawings and plans, documenting early Christian Irish art, its inspiration and the extent of its influence in Europe, in areas including architecture, sculpture, manuscripts, metalwork, ivory and textiles.

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.

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.

A collection of material relating to Kevin Barry, who was executed for his part in the killing of three British soldiers in 1920. The collection includes material associated with his days at Belvedere College, his year as a medical student in UCD, and his brief time in custody at Mountjoy Prison before execution. The majority of the collection is composed of material gathered by Kathy Barry Maloney, Barry's sister, after his death.

Correspondence between John O'Donovan (1809-1861), and, principally, William Reeves (1815-1892): eighty letters (1832-1860) and twenty-six undated note fragments.

[Handwritten notes and pencil sketches relating to illuminated manuscripts of the twelfth and thirteenth centuries.]

[Pencil sketches on tracing paper of decoration in the manuscript (Lindau Book cover (New York). Handwritten notes regarding the parallels with 'North-East Central Asian Bronzes'.]

A collection of material related to the Easter Rising 1916 from the IBVM (Loreto) Institute & Irish Province Archives, including contemporaneous accounts of the Rising as observed by the Loreto Sisters at St Stephen’s Green Dublin and Loreto Abbey Rathfarnham. The material is collated from three separate Loreto archival collections: the community archives of Loreto Abbey Rathfarnham; Loreto College, 53 St Stephen’s Green; and M. Michael Corcoran IBVM, Superior General 1888 – 1918. The collection comprises of two manuscript community annals, a military permit, picture postcards from Loreto Abbey Rathfarnham and Loreto College, 53 St Stephen’s Green, and a typed letter from M. Michael Corcoran IBVM, Superior General 1888 – 1918.

A collection of the surviving letters of Honora (Nano) Nagle (1718-1784), foundress of the Sisters of the Presentation of the Blessed Virgin Mary (PBVM). Nano Nagle brought the Ursuline congregation to Ireland, before founding the Presentations. This collection represents a digital reunification of the surviving letters. A cousin of Edmund Burke, Nano was a member of a prominent Catholic landowning family in Munster. The material is collated from three separate archival collections: the Presentation Sisters Congregational Archives, Cork (PSCA); the archives of the Presentation Convent, George's Hill, Dublin; and the Presentation Archives, San Francisco, USA. Within the PSCA, there are letters originally belonging to the Archives of the Ursuline Convent, Blackrock, Cork; these letters were gifted to the Irish Presentation Sisters on the occasion of the tercentenary of the birth of Nano Nagle (2018). There is also one letter that was gifted by the Presentation Convent, New Windsor, USA, on the occasion of the tercentenary. The digital collection comprises of seventeen manuscript letters; the letters are from Nano Nagle to Eleanor Fitzsimons (later Sr. Angela Fitzsimons), an Irish religious novice in Paris, and from Nano Nagle to Teresa Mulally, educator of the poor, in Dublin.

[Research notes relating to the manuscript of St. Gall Priscian, 904.]

[Research notes and pencil sketches relating to manuscripts held in the National Library, Turin.]

[Notes and pictures relating to the Emly, Moymusk, Roscommon, Shannon and Lough Erne Shrines.]

[Research notes relating to the illumination of the manuscript (Turin O.IV.20) and list of folio numbers.]

[Research notes and illumination relating to the text of the Leyden Priscian manuscript.]

[Research notes and pencil sketches relating to the Martyrology of Tallaght/ Book of Leinster in the Franciscan Library, Dublin.]

[Research notes and pencil sketches relating to background to the manuscripts in the Vatican Library.]

[Research notes relating to the background to the Psalter of St Caimin. Small pencil sketches of decoration on folios.]

[Research notes relating to the decoration of the Add. MS 36929 (British Museum). Includes notes by another hand and typed and handwritten Latin transcription of part of the text.]

[Pencil sketches in colour of decoration from various folios from Galba A.V. (British Museum).]

[Paris Manuscripts. Facsimile images all mounted for inclusion in the catalogue of images. Those with numbers on the mounts have photographs already in the photographic collection.]

[Notes and references to the name 'O'Moore' in various manuscripts.]

[Research notes relating to different books and references on Early Christian Art.]

Handwritten notes of paleographical abbreviations, list of manuscripts to photograph, and comparison sketches between Vat. Lat. 1202 and Bertaux.

[Handwritten research notes concerning The Rabula Gospels in the Laurentian Library, Florence.]