Papurau Robert Williams Parry, 1873-1971, gan gynnwys llawysgrifau, copïau teipysgrif a phrintiedig o gerddi Robert Williams Parry (yn bennaf rhai cyhoeddedig, gyda pheth amrywiadau), [1900]-[1956]; cyfieithiadau o'i gerddi,1941-1942; cerddi gan bobl eraill a anfonwyd at RWP, 1943-1956; erthyglau gan RWP ar feirdd a barddoniaeth,1911-1933; cyfieithiadau RWP o ddramâu Saesneg, [20fed ganrif]; sgriptiau radio gan RWP, 1941-1953, a sgriptiau radio rhaglenni ar RWP, 1956; erthyglau RWP i gylchgronau, 1918-1957; erthyglau ar RWP a'i waith, 1925-1959; llyfrau nodiadau yn cynnwys nodiadau RWP ar lenyddiaeth Gymraeg a'r ieithoedd Celtaidd, [20fed ganrif]; llythyrau at RWP, 1908-1954; llythyrau yn llongyfarch RWP, 1910-1953; copïau o lythyrau RWP at Aneirin Talfan Davies, 1937-1949 llythyrau RWP at Myfanwy Williams Parry, 1935-1953; llythyrau eraill a phapurau Myfanwy Williams Parry, 1953-1971; llythyrau'n cydymdeimlo â Myfanwy Williams Parry, 1956; llythyrau at J. Maldwyn Davies, 1971-1975; cardiau post, cardiau Nadolig a chardiau coffa, [20fed ganrif]; dyddiaduron poced RWP a Myfanwy Williams Parry, 1923-1969; tystysgrifau geni, priodi a marw a chopi o ewyllys RWP, 1884-1956; adroddiadau ysgol, tystysgrifau a cheisiadau am swyddi, 1896-1914; copïau o bapurau arholiad, 1938-1944; torion papur newydd yn ymwneud ag RWP, 1907-1971; taflenni apêl Cofeb R. Williams Parry, 1956-1971; llyfrau printiedig, 1890-1969; a phapurau amrywiol, 1873-1969. = Papers of Robert Williams Parry, 1873-1971, comprising manuscripts, typescripts and printed copies of poems by Robert Williams Parry (mainly published, with some variations), [1900]-[1956]; translations of his poems, 1941-1942; poems by others addressed to RWP, 1943-1956; articles by RWP on poets and poetry, 1911-1933; translations by RWP of English plays, [20th century]; radio scripts by RWP, 1941-1953, and radio scripts of programmes about RWP, 1956; magazine articles by RWP, 1918-1957; articles on RWP and his work, 1925-1959; notebooks containing notes by RWP on Welsh literature and Celtic languages, [20th century]; lecture notes of RWP on Welsh literature and individual poets, [20th century]; letters to RWP, 1908-1954; letters of congratulation to RWP, 1910-1953; copies of letters from RWP to Aneirin Talfan Davies, 1937-1949; letters of RWP to Myfanwy Williams Parry, 1935-1953; other letters to papers of Myfanwy Williams Parry, 1953-1971; letters of condolence to Myfanwy Williams Parry, 1956; letters to J. Maldwyn Davies, 1971-1975; postcards, Chritsmas cards and memorial cards, [20th century]; pocket diaries of RWP and Myfanwy Williams Parry, 1923-1969; birth, marriage and death certificates and copy of RWP's will, 1884-1956; school reports, certificates and job applications, 1896-1914; copies of examination papers, 1938-1944; newspaper cuttings relating to RWP, 1907-1971; pamphlets of the Cofeb R. Williams Parry appeal, 1956-1971; printed books, 1890-1969; and miscellaneous papers, 1873-1969.

Papurau T. H. Parry-Williams yn ymwneud â'i addysg brifysgol ac fel athro, 1905-1960, teithiau i Dde a Gogledd America, 1925 a 1935, llythyrau oddi wrth deulu, cyfeillion ac amrywiol lenorion, academyddion ac ysgolheigion o Gymru ac Ewrop, 1908-1973, barddoniaeth wedi'i threfnu yn ôl ei ffurf, 1912-1954, ysgrifau,1937-1987, cyfieithiadau ysgrifau, 1987, beirniadaethau eisteddfodol, 1941-1971, darlithiau ac anerchiadau, 1917-1968, sgyrsiau a sgriptiau radio a theledu, 1933-1985, nodiadau ar dafodieithoedd ac enwau lleoedd, 1919-1935, geiriau Cymraeg i gerddoriaeth, 1929-1979, papurau'n ymwneud â'i waith cyhoeddus, 1916-1972, tystysgrifau, anrhydeddau a phersonalia, 1904-1960, cyhoeddiadau, adolygiadau llyfrau a thorion o'r wasg, 1928-1982, deunydd cyhoeddedig, 1865-1975, ac amrywiol, 1919-1994. Hefyd papurau Amy Parry Williams, 1910-1987, yn cynnwys gohebiaeth, 1948-1987, rhaglenni radio a theledu, caneuon gwerin a cherdd dant, storïau, ysgrifau a dramâu, a phapurau'n ymwneud â HTV, ymddiriedolaethau a phwyllgorau. Yn ogystal, papurau Henry Parry-Williams (1858-1925), tad T. H. Parry Williams yn cynnwys gohebiaeth, 1884-1920, barddoniaeth a rhyddiaith, 1891-1917, papur yn ymwneud â Robert R. Williams, Rhyd-ddu, 1876-1973 a Chanolfan Rhyd-ddu, 1972-1979 = Papers of T. H. Parry-Williams relating to his university education and teaching, 1905-1960, travels to South and North America, 1925 and 1935, letters from family, friends and various Welsh and European writers, academics and scholars, 1908-1973, poetry arranged by form, 1912-1954, essays, 1937-1987, translations of essays, 1987, eisteddfodic adjudications, 1941-1971, lectures and talks, 1917-1968, radio and television talks and scripts, 1933-1985, notes on dialects and local names, 1919-1935, Welsh lyrics for music, 1929-1979, papers relating to his public work, 1916-1972, certificates, honours and personalia, 1904-1960, publications, book reviews and press cuttings, 1928-1982, published material, 1865-1975, and miscellaneous, 1919-1994. Also Amy Parry Williams' papers, 1910-1987, including correspondence, 1948-1987, radio and television programmes, folk songs and cerdd dant, stories, writings and drama, and papers relating to HTV, trusts and committees. And also papers of Henry Parry-Williams, (1858-1925) father of T. H. Parry-Williams including correspondence, 1884-1920, poetry and prose, 1891-1917, paper relating to Robert R. Williams, Rhyd-ddu, 1876-1973 and Canolfan Rhyd-ddu, 1972-1979.

Mae'r casgliad yn cynnwys papurau personol, rhai ohonynt ynglŷn â pharatoi a chyhoeddi cofiant Brinley Richards i Trefin yn 1963, nodiadau ar achau Trefin a chefndir y teulu a luniwyd gan Maxwell Fraser, llythyrau cydymdeimlad a dderbyniodd Maxwell Fraser yn dilyn marwolaeth Trefin ar 30 Awst 1962, papurau'n ymwneud â marwolaeth, angladd etc. Trefin; personalia, yn cynnwys dyddiaduron Trefin am ychydig flynyddoedd yn unig rhwng 1926 a 1962, llyfrau lloffion, copïau rhydd o dorion o'r wasg, papurau'n ymwneud â gyrfa proffesiynol Trefin rhwng 1923 a 1954, a chardiau cyfarch a dderbyniodd ar wahanol achlysuron; llythyrau cyffredinol, 1936-1962, a anfonwyd at Trefin, ynghyd â grwpiau o lythyrau a dderbyniodd ar adegau penodol, megis ar ennill y Gadair yn Wrecsam yn 1933, ar ei briodas â Maxwell Fraser yn 1951, ac ar gael ei ddewis yn Archdderwydd Cymru yn 1959, ynghyd a grŵp o lythyrau Trefin at Maxwell Fraser, 1948-1962; papurau'n ymwneud â'r Orsedd a'r Eisteddfod, 1923-1962, copïau drafft a theipysgrif o waith llenyddol a chyhoeddiadau Trefin, gan gynnwys cerddi, pregethau, storïau byrion, sgriptiau radio, dramâu, erthyglau i gylchgronau, areithiau ac anerchiadau, a chyfieithiadau o lyfrau taith Maxwell Fraser; papurau'n ymwneud ag ymchwil Trefin ar Aneurin Fardd, 1957-1965, Edmund Jones, 1958-1962, ac ar gyfer Presenting Monmouthshire, 1963-1971; llyfrau nodiadau Trefin yn cynnwys nodiadau academaidd; llyfrau nodiadau'n cynnwys nodiadau a gymerodd Eluned Phillips yn yr ysgol a'r coleg; papurau amrywiol, 1876-1955; eitemau printiedig, 1928-1961, gwahanlithoedd a chopïau printiedig o ddeunydd gan Trefin yn bennaf; ac eitemau printiedig amrywiol, 1898-1960. = The collection comprises personal papers, some relating to the preparation and publication of the biography of Trefin by Brinley Richards in 1963, notes on Trefin's ancestry and family background prepared by Maxwell Fraser, sympathy letters sent to Maxwell Fraser following Trefin's death on 30 August 1962, papers relating to Trefin's death, funeral etc.; personalia, including Trefin's diaries for only a few years between 1926 and 1962, scrapbooks, loose press cuttings, papers concerning Trefin's professional career as a teacher between 1923 and 1954, and greetings cards which he had received on various occasions; general letters, 1936-1962, addressed to Trefin, together with groups of letters on specific occasions, such as winning the chair at Wrexham in 1933, on his marriage to Maxwell Fraser in 1951, and on his selection to be archdruid of Wales in 1959, together with a group of letters, 1948-1962, from Trefin to Maxwell Fraser; papers concerning the Gorsedd and the Eisteddfod, 1923-1962; drafts and typescripts of Trefin's writings and publications, including poems, sermons, short stories, radio scripts, plays, articles for journals, speeches and addresses, and translations of Maxwell Fraser's travel writings; papers relating to Trefin's researches on Aneurin Fardd, 1957-1965, Edmund Jones, 1958-1962, and for Presenting Monmouthshire, 1963-1971; Trefin's notebooks bearing academic notes; notebooks containing school and college notes taken by Eluned Phillips; miscellaneous papers, 1876-1955; printed items, 1928-1961, mainly offprints and printed copies of material written by Trefin; and miscellaneous printed items, 1898-1960.

Papers of and acquired by R. Bryn Williams, mainly relating to the Welsh settlement in Patagonia, including a diary of Joseph Seth Jones, one of the first wave of emigrants on the Mimosa to Patagonia, 1865, and correspondence, 1865-1868; correspondence of his brother, Robert Charles Jones, 1867-1877; copy records of the Welsh courts in Y Wladfa, 1872-1881; letters and minute books relating to Vrondeg Baptist Chapel, 1875-1887, Gaiman, 1877-1891, Eglwys Llanddewi, 1891, Eglwys Bryn Gwyn and Cyfarfod Misol Y Wladfa (Calvinistic Methodists), 1881-1955; papers relating to the Centenary Celebrations of the Welsh settlement in Patagonia, 1952-1962; letters from the founders of the Welsh colony, 1866, and from others who had experienced life there; letters to R. Bryn Williams from Patagonia and from Wales relating to Patagonia, [c. 1941-1961]; research notes and manuscripts of books and radio plays by R. Bryn Williams, 1942-1962; miscellaneous records relating to Wales and elsewhere collected by Williams, 1865-1962; papers relating to John S. Williams, 1901-1962; papers and press cuttings on the history, culture and industry of Patagonia, 1869-1962; and typescripts of published and unpublished works, lectures, scripts, etc.

Papers of, and relating to, Dylan Thomas, [1925x2013], collected and collated by Jeff Towns, including scripts, correspondence, programmes and papers relating to the publication of Under Milk Wood, and radio, stage, film and audio productions of the play, 1953-2005; research papers and works relating to Dylan Thomas, 1937-2006; letters by Dylan Thomas, and the letters and papers of his wife Caitlin, their three children and his parents, 1935-2007; autograph prose works, [1925x1953], and personal papers, [1929]-1960; poetry, [1928x2010], mostly comprising autograph drafts; unpublished autograph letters by Dylan Thomas, [1926]-1995; and a small group of material, 1939-[2013], including four autograph letters, 1939, from the author, relating to The map of love.