Very extensive collections, manuscript and printed, for recusant studies and the history of 18th-19th century Catholicism in England, especially in the North. Over 40,000 printed titles, the great majority pre-1851, including much rare pamphlet literature, 16th-19th century. The Palace Green Section of Durham University Library has a copy of Ushaw's catalogue of its printed material.
Ushaw's archives are extensive and include material relating to the English College at Douai, from which it descends. Other holdings include medieval book manuscripts, especially books of hours, Radcliffe (Earls of Derwentwater) papers and relics; Jacobite papers, mostly letters in English and French to Canon Walter Thomas Tyrell; Eyre papers, chiefly legal, throwing light on the operation of the penal laws, probably collected by Vincent Eyre, attorney and land agent for the Duke of Norfolk; letters and papers of leading 19th century Roman Catholics, especially John Lingard and Cardinal Nicholas Wiseman; papers collected by the Revd. Thomas Eyre for a continuation, never carried out, of Dodd's history, and illustrating the history of English Catholicism, 17th-19th century; archives of the English College at Lisbon, 1628-1971, including correspondence of Bishop Richard Russell (1630-93), who was confessor of Queen Catherine of Braganza and worked for some years in the Portuguese diplomatic service; and the papers of two Anglo-Portugese families, Jorge and Donovan, concerning trade between the two countries in the earlier 19th century.