Biographical sketches of Welsh priests, 1568-1795; research notes and papers on the education of Welsh recusants, 1579-1648; research papers relating to Welsh Catholic printed books, 1579-1777; research papers relating to Catholics in Breconshire, 1799-1830; press cuttings, 1953-1957, mainly from The Tablet, relating to Ronald Knox (1888-1957), and to the Carmelites in Wales; letters, 1953-1958, relating to Welsh Martyrs; undated notes on the Welsh clergy in Seville, 1591-1671; the Clifton diocesan archives, 1827-1828; letters, 1989-1993 and undated, from Emeritus Professor R. Geraint Gruffydd; Welshmen at Rheims, 1579-1593, and Catholic Record Society letters, 1993-1994; press cuttings, 1938-1993 and undated on reviews of religious books and archaeology; photocopies relating to Holywell, Caerwys and Llanfechain in the seventeenth century; photocopies of correspondence and papers of James Peter Coghlan (1731-1800), 1797-1799; Sir Edward Carne (c.1496-1561); Father John Kemble (1599-1679); the Blessed David Lewis (1616-1679); letters, 1956-1963, relating to the publications of The Catholic Recusancy of the Barlow Family of Slebech in Pembrokeshire the XVI and XVII Centuries (Cardiff, 1956), and A Checklist of Welsh Students in the Seminaries, 1568-1603 (Cardiff, 1958); letters, 1939-1997; genealogical notes on the Cleary line and radio scripts.