Papers, 1917-1980, of Tom Macdonald, including manuscript drafts of his published and unpublished novels and short stories; non-fictional writing and research notes relating to his work as a journalist; correspondence; poetry; plays; a collection of newspaper cuttings; minutes of committee meetings, 1917-1921; educational certificates, 1918-1919.

Drafftiau o sgriptiau i'r 12 pennod o Dihirod Dyfed, [1987]-[1991], yn ogystal â theipysgrifau a llawysgrifau o rai penodau o'r llyfr o'r un enw, [1991]; torion papur newydd yn ymwneud â'r gyfres gyntaf,1987-1989, a llungopi o'r llyfryn Dihirod Dyfed a gynhyrchwyd gan S4C,1988 = Drafts of scripts for the 12 episodes of Dihirod Dyfed, [1987]-[1991], as well as typescripts and manuscripts of some of the chapters from the book of the same name, [1991]; newspaper cuttings relating to the first series, 1987-1989; and a photocopy of the booklet Dihirod Dyfed produced by S4C, 1988.

Papurau llenyddol Lilian Rees, llyfrau nodiadau yn bennaf yn cynnwys cyfansoddiadau gan gynnwys Llyfr Eiry a rhyddiaith a barddoniaeth a gyfrannwyd i gyfnodolion ac eisteddfodau, ynghyd ag atgofion personol,[1920au]-1996 = Literary papers of Lilian Rees, mainly notebooks containing compositions including Llyfr Eiry and prose and poetry written for periodicals and eisteddfodau, together with personal memoirs, [1920s]-1996.

Papurau yn ymwneud ag amrywiaeth eang o weithgareddau Brinli yn cynnwys llyfrau ysgol a defnyddiau addysgiadol eraill, 1915-1977; papurau cyfreithiol, yn bennaf gohebiaeth a nodiadau, 1918-1980; cofnodion Cyngor Dosbarth Trefol Maesteg, 1927-1976; papurau Undeb Annibynwyr Cymru, 1931-1976; hanes lleol, 1927-1971; Amgueddfa Genedlaethol Cymru, 1976-1981; deunydd yn ymwneud â'i gyfrolau ar Iolo Morganwg, [1974]-[1979]; Yr Eisteddfod Genedlaethol, 1926-1981, a beirniadaethau eisteddfodol, 1943-1981; torion papur newydd, 1920-1980; rhyddiaith Brinli, 1919-1978, a barddoniaeth, 1932-1981; gweithiau llenyddol eraill ganddo ef ac eraill, 1913-1978; gohebiaeth bersonol, 1909-1981; papurau eraill personol a theuluol, 1887-1981; ei ddyddiaduron, 1922-1981, a rhai ei dad, Joshua, 1893-1944; cofnodion Cylchdaith Annibynnwyr De Morgannwg, 1841-1978, Capel Siloh, 1850-1977, Eisteddfod Genedlaethol 1932 a 1948 ac eraill, 1932-1981; papurau Lewis Davies, Y Cymer (1863-1951), awdur nofelau i blant, [1849?]-1946, yn cynnwys sawl llyfr rent o Benderyn; papurau, 1883-1925, Rhys Dafydd Morgan (1851-1934), cyfieithydd o Gymro a fferyllydd ym Maesteg; papurau, 1882-1968, 'Wil Ifan' William Evans (1882-1968), archdderwydd, gweinidog yr Annibynwyr ac awdur; a phapurau, 1929-1979, 'Trefin, Edgar Phillips (1889-1962), bardd ac archdderwydd. = Papers concerning a wide variety of Brinli's activities including school books and other educational material, 1915-1977; legal papers, mainly correspondence and notes, 1918-1980; Maesteg Urban District Council records, 1927-1976; the Welsh Congregational Union papers, 1931-1976; local history, 1927-1971; the National Museum of Wales, 1976-1981; material relating to his books on Iolo Morganwg, [1974]-[1979]; the National Eisteddfod, 1926-1981, and eisteddfod adjudications, 1943-1981; newspaper cuttings, 1920-1980; Brinli's prose, 1919-1978, and poetry, 1932-1981; other literary works by him and others, 1913-1978; personal correspondence, 1909-1981; other personal and family papers, 1887-1981; his diaries, 1922-1981, and those of his father, Joshua, 1893-1944; records of the South Glamorgan Congregational Circuit, 1841-1978, Siloh Chapel, 1850-1977, and of the National Eisteddfodau of 1932 and 1948 and others, 1932-1981; papers of Lewis Davies, Y Cymer (1863-1951), author of children's novels, 1849-1946, including several rate books for Penderyn; papers, 1883-1925, of Rhys Dafydd Morgan (1851-1934), Welsh translator and Maesteg pharmacist; papers, 1882-1968, of 'Wil Ifan', William Evans (1882-1968), archdruid, congregational minister and author; and papers, 1929-1975, of 'Trefin', Edgar Phillips (1889-1962), poet and archdruid.

Papurau Dyddgu Owen, 1934-1991, yn cynnwys drafftiau teipysgrif a llawysgrif o'i nofelau a gweithiau llenyddol eraill,1953-1986; amrywiol darlithoedd ac anerchiadau, 1950au-1980au; sgriptiau ar gyfer radio a theledu, 1957-1976; dyddiaduron, 1978-1989; llyfrau nodiadau, 1957-1970; gohebiaeth, 1946-1991; dyddiaduron, 1978-1989; llyfrau lloffion o dorion o'r wasg, 1957-1970; papurau amrywiol yn ymwneud â'i diddordebau, 1969-1977; a phapurau Sarah Ceridwen (Ceri) Davies,1944-1991, yn cynnwys cofnodion gweinyddol cymdeithas 'Cyfeillion Ellis Wynne' [Lasynys] = Papers of Dyddgu Owen, 1934-1991, including typed and manuscripts drafts of her novels and other literary works, 1953-1986; various lectures and addresses, 1950s-1980s; radio and television scripts, 1957-1976; diaries, 1978-1989; notebooks, 1957-1970; correspondence, 1946-1991; diaries, 1978-1989; scrap books of press cuttings, 1957-1970; miscellaneous papers relating to her interests, 1969-1977; and papers of Sarah Ceridwen (Ceri) Davies, 1944-1991, which include administrative records of the society 'Cyfeillion Ellis Wynne' [Lasynys].

Mae'r casgliad yn cynnwys deunydd a gasglwyd gan y cynllun yn ymwneud â'r llenorion Cymraeg canlynol: E. Tegla Davies, Huw Lloyd Edwards, Harri Gwynn, D. Gwenallt Jones, John Gwilym Jones, J. Saunders Lewis, Alun Llywelyn-Williams, T. H. Parry-Wiliams, Caradog Prichard, Kate Roberts, D. J. Williams, Abergwaun, Huw Llewelyn Williams a Waldo Williams. Mae'r archif yn cynnwys hefyd adysgrifau o rhai o'r casetiau o atgofion awduron Cymraeg diweddar a recordiwyd gan staff y cynllun ymchwil, ychydig eitemau o archifau yr Academi, deunydd yn ymwneud â gweithgareddau'r Academi a'r cynllun ymchwil, papurau ynglŷn â Geiriadur yr Academi a gwobr Griffith John Williams, a gohebiaeth yn deillio o'r cynllun ymchwil = The collection comprises material collected by the scheme relating to the following Welsh literary figures: E. Tegla Davies, Huw Lloyd Edwards, Harri Gwynn, D. Gwenallt Jones, John Gwilym Jones, J. Saunders Lewis, Alun Llywelyn-Williams, T. H. Parry-Wiliams, Caradog Prichard, Kate Roberts, D. J. Williams, Fishguard, Huw Llewelyn Williams and Waldo Williams. The archive also includes transcripts of some of the casettes of reminiscences of recent Welsh authors recorded by the staff of the research project, a few items from the archives of the Academi, material relating to the activities of the Academi and the research project, papers concerning the Welsh Academi Dictionary and the Griffith John Williams Prize, and correspondence deriving from the research scheme.