Papurau personol, proffesiynol a llenyddol D. Tecwyn Lloyd, [1870]-1998, gan gynnwys papurau pan fu'n Gymrawd Ymchwil yn Rhufain, 1951-1952; nifer fawr o lythyrau yn deillio o’i gyfnod yn olygydd y cylchgrawn Taliesin, 1965-1987; dyddiaduron, 1931-1992; papurau'n ymwneud â'i waith ymchwil ar Saunders Lewis; ynghyd â’i draethawd MA, 1961. Ceir hefyd papurau a grynhowyd ganddo. -- Personal, professional and literary papers of D. Tecwyn Lloyd, [1870]-1998, including papers relating to his time as Research Fellow in Rome; 1951-1952; letters relating to his work as editor of the literary periodical Taliesin, 1965-1987; his diaries, 1931-1992; his research on Saunders Lewis; together with his MA thesis, 1961. Also included are papers accumulated by him.

Papurau Wil Ifan, 1896-1982, yn cynnwys llythyrau ato, 1902-1966, ac oddi wrtho at ei deulu, 1915-1966; gweithiau cyhoeddedig a barddoniaeth a rhyddiaith, yn Saesneg yn bennaf, yn cynnwys nodiadau, [1920]-1956; pregethau, 1921-1933; dyddiaduron, 1900-1947; sgriptiau radio, 1952-1963; a chopïau o Celt a olygwyd gan Dan Evans, 1896-1897. = Papers of Wil Ifan, 1896-1982, including letters to him, 1902-1966, and from him to his family, 1915-1966; published works and poetry and prose, mainly in English, including notes, [1920]-1956; sermons, 1921-1933; diaries, 1900-1947; radio scripts, 1952-1963; and copies of Celt, edited by Dan Evans, 1896-1897.

Hefyd yn cynnwys astudiaeth Shirley Wynne Vinall, 2019, wedi ei argraffu a’i rwymo yn ddwy gyfrol, o 'Llyfr yr Achau' gan 'Wil Ifan', yn cynnwys detholiadau o lyfr nodiadau ei thaid ar hanes ei deulu, gwybodaeth am deuluoedd ei fam a’i dad yn Sir Gaerfyrddin, Cwmafan a Sir Aberteifi, a theulu ei wraig Nesta Wyn Edwards, Dolgellau, ynghyd â phennod ychwanegol gan y rhoddwr ar ei yrfa a’i ysgrifau. Ceir hefyd gopi llawysgrif o’r emyn "O Jesu, King most wonderful", a gyfieithwyd gan y Parch. E. Caswall, gyda cherddoriaeth gan B[ertram] J. Orsman, 1946, wedi’i lofnodi a’i gyflwyno gan y cyfansoddwr i’r Parch. W. Evans ('Wil Ifan'). = Also includes a study by Shirley Wynne Vinall, 2019, printed and bound in two volumes, of 'Llyfr yr Achau' by 'Wil Ifan', including extracts from her grandfather’s notebook on his family history, and containing information about his maternal and paternal families in Carmarthenshire, Cwmavon and Cardiganshire, and the family of his wife Nesta Wyn Edwards, Dolgellau, together with an additional chapter by the donor on his career and writings. Also included is a manuscript copy of the hymn "O Jesu, King most wonderful", translated by Rev. E. Caswall, with music by B[ertram] J. Orsman, 1946, signed and presented by the composer to the Rev. W. Evans ('Wil Ifan').

Papurau a roddwyd Hydref 2022: gweler y disgrifiad dan y Gyfres ychwanegol.

Papurau W. Crwys Williams, 1863-1967, yn cynnwys llythyrau, llyfrau nodiadau yn cynnwys cerddi, pryddestau a gyflwynwyd ar gyfer cystadleuaeth y goron yn yr Eisteddfod Genedlaethol, sgriptiau, pregethau, copi teipysgrif o'i ewyllys, 22 Rhagfyr 1958, a fersiwn diweddarach, 15 Medi 1964. Ceir papurau hefyd, 1873-1891, yn perthyn i'w dad-yng-nghyfraith y Parchedig Robert Charles Jones (1847-1925), gweinidog gyda'r Methodistiaid Calfinaidd a fu'n genhadwr yn Chile, 1874-1878. = Papers of W. Crwys Williams, 1863-1967, comprising letters, notebooks including poems, poems in free metre entered in competitions for the crown in National Eisteddfodau, scripts, sermons, typescript copy of his will, 22 December 1958, and an updated version, 15 September 1964. Also included are papers belonging to his father-in-law the Rev. Robert Charles Jones (1847-1925), Calvinistic Methodist minister who was a missionary in Chile, 1874-1878.

Over seventy letters and cards, 1917-1986, of miscellaneous provenance from twentieth-century Welsh writers to various recipients; the correspondents include E. Tegla Davies (1) 1956, W. J. Gruffydd (1) 1952, R. T. Jenkins (1), 1946, David James Jones (Gwenallt) (1) 1953, T. Gwynn Jones (9) 1923-1939, J. Saunders Lewis (5) 1931-1976, Caradog Prichard (4) 1962-1972, Kate Roberts (28) 1937-1983, D. J. Williams (6) 1917-1969, and T. H. Parry-Williams (1) 1953.

Ninety-four letters, 1919-1984, in Welsh and English, to Saunders Lewis from various correspondents, together with a few draft letters from Saunders Lewis and four letters to Margaret Lewis, written during her husband's imprisonment in 1937. Subjects discussed include Welsh nationalism, the award of DLitt honoris causa to Saunders Lewis, the Welsh Burial Grounds issue, 1928, and literary topics; enclosures include a copy of a draft constitution and articles of agreement, 1934, relating to self-government for Wales (ff. 161-95). Among the main correspondents are Edward Glyn Jones (13) 1919-28, Robert Williams Parry (14) 1927-44, John Arthur Price (5) 1928, E. Prosser Rhys (3) 1927-9, D. J. Williams, Fishguard (7) 1948-67, and Griffith John Williams (3) 1935-56.

Papurau Carneddog a rhai a gasglwyd ganddo, 1743-1947, yn cynnwys rhyddiaith a barddoniaeth ganddo ef ac eraill ar gyfer eu cyhoeddi, yn cynnwys colofn 'Manion o'r Mynydd'; torion papur newydd o'i waith ef ac eraill; gwaith gan awduron adnabyddus a gasglodd, yn eu mysg cerddi David W. Morris ('Dewi Glan Dulas', 1853-95) a dyfyniadau cywyddwyr; ei nodiadau bywgraffiadol ar awduron; papurau personol a theuluol, yn cynnwys llythyrau a anfonwyd ganddo o Iwerddon, pan oedd yn gwella o salwch yn 1899; swm sylweddol o ddeunydd yn ymwneud â hanes Beddgelert a phlwyfi cyfagos, yn cynnwys llyfrau lloffion gyda nodiadau llawn, copi llawysgrif o hanes Beddgelert a nifer o deuluoedd lleol, a llyfr rent Carneddi, 1743-1832; a nifer fawr o lythyrau at Garneddog, llawer ohonynt yn ymwneud â'i golofn yn yr Herald, a hefyd yn cynnwys llythyrau gan awduron Cymreig a llythyrau o UDA ac Awstralia. = Papers, 1743-1947, of and collected by Carneddog, comprising prose and poetry by him and others towards publications including the 'Manion o'r Mynydd' column; newspaper cuttings of his own work and that of others; works by well-known authors collected by him, including poems of David W. Morris ('Dewi Glan Dulas', 1853-95) and quotations from the cywyddwyr; biographical notes by him on authors; personal and family papers, including letters sent by him from Ireland, where he was recuperating from illness in 1899; a considerable amount of material relating to the history of Beddgelert and neighbouring parishes, including fully annotated scrapbooks, a manuscript history of Beddgelert and of several local families, and a rent book from Carneddi, 1743-1832; and a large number of letters to Carneddog, many of them relating to his column in the Herald, and also including letters of Welsh authors and letters from the USA and Australia.

Papurau llenyddol, proffesiynol a phersonol Iorwerth C. Peate, 1826-1983, gan gynnwys nifer helaeth o lythyrau; papurau yn ymwneud ag amryw o'i weithiau llenyddol; papurau ynglŷn â'i yrfa broffesiynol, yn cynnwys sefydlu Amgueddfa Werin Cymru; a ffeiliau ar bynciau penodol yn ymwneud â diwylliant gwerin. Yn ogystal ceir papurau aelodau o'i deulu, yn eu plith dyddiaduron, llyfrau nodiadau, llythyrau a chyfrifon. Ceir hefyd bapurau a grynhowyd gan Iorwerth Peate a'i berthnasau. -- Literary, professional and personal papers of Iorwerth C. Peate, 1826-1983, including a substantial group of letters; papers relating to various literary works by him; papers regarding his professional career, including the establishment of the Welsh Folk Museum; and files concerning specific subjects relating to folk culture. In addition, the archive contains papers pertaining to members of his family, among which are diaries, notebooks, letters and accounts. Also included are papers accumulated by Iorwerth Peate and his relatives.