This collection consists largely of letters from Roger Casement to Captain Hans Boehm, during Casement's stay in Germany in 1915, as well as some associated material (photographs, medals) relating to his first contact with the German authorities in November and December 1914 and the formation of the Irish Brigade in 1915.

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.

Correspondence relating to Fr Luke Wadding OFM and the Irish Friars Minor at St. Isidore’s College, Rome, on ecclesiastical and political matters; and concerning his interests as historian of the Franciscan Order.

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.

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

The Irish Virtual Research Library and Archive (IVRLA) is a digitisation project launched in UCD in January 2005. The project was conceived as a means to increase and facilitate access to UCD's cultural heritage repositories through the adoption of digitisation technologies.