Papurau, 1922-1966, yn ymwneud â Phlaid Cymru yn genedlaethol ac yn lleol yn Sir Benfro gan gynnwys llyfrau cofnodion Pwyllgor Rhanbarth Dyfed, 1938-1947, a rhestri etholwyr Abergwaun a rhestr o aelodau'r Blaid yn 1966 yn Sir Benfro.

Extensive and wide ranging records of the Pembrokeshire Conservative Association, including files of local branches, 1930-1990; and files relating to the following: general administration, 1949-1994, (including general correspondence, 1956-1994); area organization, 1950-1991; local committees, 1955-1994; women's groups and events, 1950-1990; local government, 1950s-1986; elections, 1954-1987; parliamentary candidates, 1952-1974; Rt Hon. Nicholas Edwards MP, 1972-1989; Nicholas Bennett MP, 1987-1992; social events, 1957-1988 (including draws, 1960-1988, and Colby Cup Whist Tournaments, 1961-1990); constituency issues, 1981-1988; national politics, 1951-1992; national organization, 1954-1984, including party conferences, 1969-1990; visits of politicians, 1961-1987; publications, 1962-1994; press cuttings, 1976; and miscellanea, 1984-1988.

Papers of political interest, 1909-1995, including papers relating to local and general elections, in Swansea West, 1982-1983; Pontypridd, 1987; Pembroke, 1991-1992; Vale of Glamorgan, 1985-1993; papers relating to the SDP, 1983-1994, including correspondence, minutes, press releases; papers relating to the SDP/Liberal Alliance, 1987-1988; papers of the Alliance Committee for Wales, 1985-1987, including correspondence, minutes of meetings, drafts of speeches, memoranda; papers of the SDP Welsh Council, 1981-1988, including correspondence, minutes of meetings, newspaper cuttings; papers of the Welsh Regional Economic Policy Group, 1981-1982; papers of the Vale of Glamorgan SDP, including CVs of prospective candidates, 1982-1983; personal papers of Peter Sain Ley Berry, [c. 1981]-1988, including correspondence and diaries; printed material, 1977-1995, including SDP policy documents and manifestos; records of the Lloyd George Society, including correspondence, 1975-1993, and printed material, 1909-1991; papers of the Welsh Centre for International Affairs, 1986-1991; and miscellaneous material, 1968-1984. The 2003 Donation, as yet uncatalogued, comprises further papers, c. 1982-2000, relating to the SDP, including papers relating to the Hillhead bye election and miscellaneous Wales in Europe papers.