Papers of Hywel D. Lewis, 1908-1992, including manuscripts and typescripts of lectures, articles and books by him, 1935-1989; papers relating to various societies of which he was a member, 1935-1989; conferences and symposia which he attended or in which he participated, 1935-1988; papers pertaining to the University College of North Wales, Bangor, 1928-1982, and King's College, London, 1954-1990; papers pertaining to Wales and the Welsh language, 1964-1988; correspondence, 1925-1992; and personal papers, 1908-1989.