Papers collected by John Bryn Roberts, including correspondence, 1830-1887; legal certificates, 1863-1897; diaries, 1838-1930, kept by Bryn Roberts and some other members of the Roberts family; photographs, [c. 1880]-1924; notes on legal cases and topics, [c. 1902]-[c. 1921]; letters, 1888-1926, from John Bryn Roberts to the press; newspaper reports transcribed, 1883-1905; notes for his speeches, 1885-1905; notes on political topics, [c.1892]-[1926]; general notes, [1860]-[1894]; election addresses, 1885-1924; political leaflets and pamphlets, 1880-1927; official publications, 1889-1927; legal publications, 1863-1930; miscellaneous printed matter, 1883-1925; Calvinistic Methodist papers, 1844-1928; papers relating to the University of Wales, mainly the University College of North Wales, Bangor, 1882-1926; newspaper and magazine cuttings, 1874-1929; newspapers and periodicals, 1902-1928; bills and receipts, 1781-1926; notebooks and account books, 1833-1900.

Papers, 1918-1954, of Professor Robert Richards comprising papers relating to the Commission on Ancient Monuments in Wales, 1919-1954; notebooks containing historical research notes and notes for lectures, extracts from books and journals, reviews, drafts of monographs and articles by Professor Robert Richards, letters from historians and authors, correspondence and papers, 1941-1954, relating to The Monastic Houses of Wales and the Borders; notebooks on economics and economic history; political papers, including material on the agricultural question, 1919-1923, Welsh Affairs, 1945-1954, parliamentary correspondence, 1934-1953, miscellaneous papers, 1918-1947, and papers concerning temperance and religion, 1924-1949; and papers reflecting Robert Richards's interest in nature, 1923-1944, including a diary for the period 1938-1944.