- Rice family, Barons Dynevor: Dynevor Castle: commonplace books (2), probably of Henry and Thomas Rice, possibly while at university 1600-1650 (DYNEVOR)
- Leighton Andrews (b1957), politician: papers incl corresp, material rel to Welsh National Assembly service, and papers rel to his early career 1962-2016 (LEIDREWS)
- Edward Tegla Davies (1880-1967), writer: papers incl diaries, corresp and photographs 1890-1967 (99899640502419)
- Emlyn Evans (1923-2014), publisher, managing director of Llyfrau’r Dryw, Llandybïe and Gwasg Gee, Dinbych: personal papers 20th cent (99881141102419)
- Rhys Evans (fl 1980-2019), broadcaster and producer: papers rel to establishment of channel S4C and interviews rel to his biography of Gwynfor Evans (NLW ex 3010)
- Glyn Tegai Hughes (1923-2017), politician, writer and critic: papers incl diaries, political papers, research files (99899641802419)
- David Michael Jones (1895-1974), painter, poet and essayist: letters (24) to Louis Bonnerot 1960-1974 (NLW MS 24128)
- John Tudor Jones (1904-1985), politician, editor and poet as John Eilian: papers 1903-1985
- Thomas Jones (c1532-1609), Welsh-language poet and genealogist: pedigree of Francis Vychan (Vichan or Vaughan) of Yorkshire, beginning with Kradog, Earle of Herefourde, Lord of Radnor 1591 (NLW MS 24125G)
- Adelina Patti (1843-1919), opera singer: letters (9) largely to Edward Hall 1883-1898 (NLW ex 3007)
- Sir Raymond Powell (1928-2001), knight, MP: political papers 1980-2005 (99884043702419)
- Peter John Mitchell Thomas (1920-2008), Lord Thomas of Gwydir, barrister, MP, Secretary of State for Wales: personal papers 1940-2008 (99885700002419)
- Philip Edward Thomas (1878-1917), poet and prose writer: notebook containing drafts of poems 'The Mountain Chapel', 'The Birds' Nests', and 'House and Man' 1914 (NLW MS 24122)
- Philip Edward Thomas (1878-1917), poet and prose writer: papers rel to Edward Thomas from the estate of John Wilton Haines incl articles, typescript poems, and letter from Helen Thomas rel to sending her husband's manuscripts c1916-1922 (NLW MS 24123)
- Waldo Williams (1904-1971), poet: papers 1920-1971 (99887725802419)
- Gregynog Press: papers of Anthony Harvey rel to the Press
- Gwasg Gee, publisher: records incl manuscripts, proofs and administrative files 1978-2010 (GEEANY)
- Gwasg Gomer, publisher: records incl financial records, scrap books, photographs, company history and diary of John D Lewis 1853-2016 (99900842102419)
- Super Furry Animals, rock band: papers incl family scrapbooks 1995-2015 (99890883402419)
- Coleg Harlech: additional records, comprising the Tudor Bowen Jones Library collection, incl material rel to college history and the history of adult education in Wales 1927-2017 (99885700302419)
- European Bureau for Lesser Used Languages: files of Allan Wynne Jones rel to Bureau business (EURBUR)
- Jazz Heritage Wales: records incl project papers (99885700402419)
- Nant Gwythern, Welsh language centre: records incl material rel to reconstruction of the abandoned village as a language centre (99889336502419)
- Plaid Cymru, Etholaeth Ceredigion: additional records 1995-2005 (PLAION)
- Undeb Amaethwyr Cymru: records (99885710302419)
- Welsh Association of Lecturers in Mathematics in the Area Training Organisation (WALMATO): records 1964-2016 (99859541502419)
- Welsh Chess Union: records incl minutes, corresp and photographs 1954-2014 (WELCHUN)
- David Jones (1796-1841), copy of Ny Dikisionary Malagasy, the first Malagasy-English dictionary, with extensive annotations by David Griffiths (1792-1863) c1835-1860 (NLW MS 24121)
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