Records collected by the United Reformed Church in Wales, 1868-1973, including Wood Street English Congregational Church, Cardiff, registers, 1891-1959, and roll books, minute books and accounts, 1868-1972; St John's English Congregational Church, Flint, subscription books, 1970-1973; English Congregational Union of North Wales, minutes and other papers, 1882-1970; Flintshire District English Congregational Union, minutes and other papers, 1935-1972; Montgomeryshire English Congregational Union, minutes, 1928-1973; trust deeds and legal papers, 1948-1968; Pembrokeshire English Congregational Union, meeting attendance book, 1952-1972; and miscellaneous correspondence, printed material and addresses, 1954-1972. ; church accounts, 1930-1949 ; minute book of Wood Street Congregational Church, Cardiff, 1868-1873; attendance book of Association and executive committee meetings of the Pembrokeshire English Congregational Union, 1952-1972.

Papers of the Congregational Federation in Wales, 1984-1997, including correspondence, 1992-1997; minutes of various committees and council meetings, 1984-1996; papers relating to Cytun, 1992-1994; and miscellaneous bulletins and denominational papers, 1992-1996.