Papurau yn cynnwys rhestri aelodaeth a ffurflenni, 1977-1985; cofnodion ariannol, 1977-1984; cofnodion pwyllgorau a phapurau eraill,1982; gohebiaeth gyffredinol yn ymwneud â'r Gymdeithas a chyhoeddi Y Cofiadur, 1975-1985; mynegai i Y Cofiadur (1923-1980), [c. 1980]; deunydd i'w gyhoeddi yn Y Cofiadur, [c.1980]; a thorion o Y Tyst, 1972-1984, yn bennaf ynglŷn â Chronfa'r Cofiadur = Papers including membership lists and forms, 1977-1985; financial records, 1977-1984; committee minutes and other papers, 1982; general correspondence relating to the Society and to publication of Y Cofiadur, 1975-1985; an index to Y Cofiadur (1923-1980), [c. 1980]; material for publication in Y Cofiadur, [c.1980]; and cuttings from Y Tyst, 1972-1984, mainly concerning `Cronfa'r Cofiadur'.

Papurau'r Parch. Richard Ellis Williams, rhai eglwysig yn bennaf, 1802-1950, yn cynnwys cyfrolau o nodiadau pregethau, 1887-1918; pregethau, 1883-1926; gohebiaeth R. A. Ellis Williams yn ymwneud â Chymdeithas Hanes Bedyddwyr Cymru a Gwobr Goffa Richard Ellis Williams, 1947-1950; a phregethau Humphrey Ellis, Salem, Cwmfelin, [1860]-1870. = Papers of the Rev. Richard Ellis Williams, mainly ecclesiastical, 1802-1950, including volumes of sermon notes, 1887-1918; sermons, 1883-1926; correspondence of R. A. Ellis Williams relating to Cymdeithas Hanes Bedyddwyr Cymru and Y Gwobr Goffa Richard Ellis Williams, 1947-1950; and sermons of Humphrey Ellis, Salem, Cwmyfelin, [1860]-1870.

Papers, 1907-1915, amassed by the donor's grandfather, the Rev. Sydney Cooper, comprising ephemera, notes, press cuttings and various periodicals relating to the campaign against Welsh Church disestablishment.

Papers of, and acquired by, the Welsh Church Commission, 1283-1960, including records of the Commission, 1914-1960; records relating to border parishes, 1914-1915; accounts, 1920-1958; papers relating to Sir Alfred Watson, 1916-1941; records concerning compensation to lay holders of freehold offices, 1915-1931; records relating to burial grounds, 1934-1947; records relating to the destination of records, 1914-1960; records relating to parish lands, 1844-1946; manorial records and court books, 1842-1925; transfer of documents, 1822-1947; deeds of properties, 1566-1929; and rentals and surveys, 1919-1947.

Correspondence, research material and photographs for the intended exhibition on Welsh chapels, 1976-1981, icluding surveys of chapels, providing architectural and historical information, and completed questionnaires. The exhibition was cancelled in 1981 following a recommendation by the Art Committee.

The original manuscript of 'Some aspects of the Christian Church in Wales', with further notes on 'The Welsh Church', 'Organisation and Worship of the Church in Century VI' and 'The Church of Wales from the first date of Brut y Tywysogion c. 680 A.D.'.