Papers relating to fringe Nationalist and left wing groups, 1963-1989, including material relating to Welsh Nationalist and Republican Groups, 1963-1989, material relating to Welsh left wing groups, 1969-1979, and papers relating to solidarity groups and campaigns, 1968-1989; published political material such as newspapers and periodicals, 1913-1989, records and papers of Cofiwn, 1970-1990, including material relating to the American Indian Movement Tour of Wales, 1986; papers relating to campaigns and activities of groups such as the the Owain Glyndwr Society, 1975-1990; papers relating to maritime history and heritage, 1973-1995; and miscellaneous papers, mainly relating to organisations in Aberystwyth, 1976-1989.

Papers of Alderman R. J. Ellis relating to Aberystwyth Borough Council and Cardiganshire County Council, mainly concerning planning and water, 1937-1975; letters relating to administration of estates, 1902-1976; personal papers, certificates, and diaries of R. J. Ellis, 1910-1972; and a letter from Irish politician Tim Healy, 1886.