Papers, 1907-1988, mainly relating to the activities of the Labour Party in Carmarthenshire and Cardiganshire, 1917-1967, including: papers of the Llanelli Trades Council and Divisional Labour Party, including minute books, 1940-1967; accounts, financial papers and cash books, 1925-1967; correspondence, 1921-1967; miscellaneous papers, 1917-1967; press cuttings, 1926-1959; and general election papers, 1931-1964; political and professional papers of Loti Rees Hughes, including correspondence, minute books and press cuttings, 1927-1965; and personal and family papers, 1935-1969; papers of W. Douglas Hughes [c. 1920]-1968, including correspondence, 1932-1967; notebooks, c. [1920]-1966; and correspondence and papers relating to Carmarthenshire County Council, 1944-1968; together with the papers of Dr Deian R. Hopkin, 1907-2000, including correspondence, 1962-2000; and miscellaneous printed material, with some concerning the Labour Party, 1907-1984 and the University College of Wales, Aberystwyth, 1960-1973.

Records of Lloyd and Son, solicitors, 1853-1930, mainly comprising general letter books, 1853-1919; letter books relating to Lampeter Poor Law Union, 1842-1930, Lampeter Borough Council, 1892-1912, Lampeter and Llanybydder Rural District Councils, 1895-1922, Lampeter Gas Company, 1900-1906, and the Northern Assurance Co. Ltd, 1907-1914; the minute book of the Lampeter Local Government Board, 1866-1879; and accounts, 1864-1890.

Deeds and documents relating to Glyneiddan, Nantgaredig, and other premises in Carmarthenshire, 1785-1955, and papers of Henry Jones-Davies, relating to local government in Carmarthenshire, 1895-1950; and to agriculture, 1910-1945, especially to agricultural co-operatives in Wales.