Papers of Bodfan, 1893-1935, comprising letters received by him, 1899-1935, mainly from friends discussing current literary trends and etymological and lexicographical matters; sermons, 1895-1901; miscellaneous poems, notes and printed matter, 1905-1933; and papers, mainly notebooks, relating to his brother Sir Edward Anwyl, 1893-1918.

Papers of Brythonydd and others, [early 18th century]-1952, comprising essays and notes on Teifiside history, 1902-1909; notes on sermons and lectures; diaries, 1906-1923; transcripts of various historical, literary and religious material including Ystradyfodwg parish records, 1735-1930, and Howel Harris' diaries, 1738-1771; transcripts of poetry by Cardiganshire poets including Gwinionydd; letters, 1898-1952; vestry books and account books of Cenarth and Penbryn and other parishes, [pre 1798]-1876; records of Libanus, Treherbert including minute books, registers and account books, 1842-1946; papers of Benjamin Williams (Gwinionydd), including letters, sermons, 1855-1890, essays, notes and poetry; papers of David James (Defynnog), Treherbert, relating mainly to the column he edited in The South Wales News and including sermons and adjudications of his uncle, Benjamin Thomas (Myfyr Emlyn), 1875-1928; papers of John Morris Jones (Ioan Cunllo), John Thomas, Charles Davies, Thomas Cynfelyn Benjamin, Lewis Jones, Treherbert, Rees Price, David Price, Joseph Davies and Rhys Lloyd Jones, Troed-yr-aur, and others, consisting mainly of poetry, accounts, letters, addresses, notebooks and sermons, [19th century]-[20th century].

Dros 600 o bregethau,1901-1963, y Parch. John Edryd Jones, sir Ddinbych.

Papurau a phregethau y Parch. Euros Bowen,1922-1983, yn cynnwys drafftiau cerddi, nodiadau darlithoedd ar ddiwinyddiaeth ac athroniaeth, 1929-1933; gweithiau llenyddol,1944-1977; dyddiaduron gwyliau, 1955-1980; gohebiaeth yn ymwneud â Chomisiwn Sefydlog Ymgynghorol Litwrgi yr Eglwys yng Nghymru a drafftiau o litwrgïau, 1967-1974; a thorion papur newydd a phapurau printiedig, 1953-1963 = Papers and sermons of the Rev. Euros Bowen, 1922-1983, including drafts of poems, lecture notes on theology and philosophy, 1929-1933; literary works, 1944-1977; holiday diaries, 1955-1980; correspondence realting to the Standing Liturgical Advisory Commission and draft liturgies, 1967-1974; and newspaper cuttings and printed papers, 1953-1983.

Papurau'r Parch. William Rhys Watkin, yn cynnwys nodiadau pregethau a phapurau eraill,1899-1936; gohebiaeth, 1878-1948, blwyddlyfrau printiedig Undeb Bedyddwyr Cymru yn cynnwys cofnodion gan WRW, 1891-1945; nodiadau ymchwil ac erthyglau ar Bedo Brwynllys, y Parch. E. T. Jones, a hanes y Bedyddwyr, 1909-[1945], a llyfr nodiadau Pwyllgor yr Eisteddfod Genedlaethol, Llanelli,1928-1931; a chofnodion a gasglwyd ganddo, gan gynnwys cofnodion a chyfrifon eglwysi'r Bedyddwyr yn sir Gaerfyrddin a Morgannwg, 1843-930; nodiadau pregethau a phapurau eraill Richard Davies ('Yr Hen Belican'),1816-1873; papurau a llyfrau nodiadau amrywiol yn ymwneud â'r Bedyddwyr Cymraeg, 1787-1896; a phapurau Thomas Jones, morwr, o Aberdaugleddau, sir Benfro, 1845-1900 = Papers of Rev. William Rhys Watkin, including sermon notes and other papers, 1899-1936; correspondence, 1878-1948, printed Baptist Union of Wales yearbooks containing entries by WRW, 1891-1945; research notes and articles on Bedo Brwynllys, the Rev. E. T. Jones, and Baptist history, 1909-[1945], and notebook of the National Eisteddfod Committee, Llanelli, 1928-1931; and records collected by him, including minutes and accounts of the Welsh Baptist Church, Eldon Street, Moorfields, London, 1846-1905; records of Baptist churches in Carmarthenshire and Glamorgan, 1843-1930; sermon notes and other papers of Richard Davies ('Yr Hen Belican'), 1816-1873; miscellaneous papers and notebooks relating to Welsh Baptists, 1787-1896; and papers of Thomas Jones, mariner, of Milford Haven, Pembrokeshire, 1845-1900.