Papers of David Robert Daniel, comprising, material relating to Thomas Edward Ellis, MP, including diaries, exercise books, speeches and election addresses, correspondence of Thomas Edward Ellis, including correspondence with D. R. Daniel, papers of his political career, copies of diaries and letters, memoirs by others and papers relating to the death of T. E. Ellis, [c. 1854x1934]; material relating to David Robert Daniel, [c. 1869x1931], including diaries, manuscript volumes and notes on places, his family and various individuals, some being eminent Welshmen, school and college papers, letters and cards to and from D. R. Daniel, including some from public men and women, relations and his wife, and miscellaneous and family papers; material relating to the North Wales Quarrymen's Union and the Penrhyn Quarry Strikes, [1878xc.1903], including reports, pamphlets, cuttings, correspondence, discussions, resolutions, and newspaper cuttings; together with material relating to David Lloyd George, including letters and cards to D. R. Daniel and to Mrs S. E. Daniel, some of which are from David Lloyd George and Megan Lloyd George [c. 1890x1966].

Two holograph letters from David Robert Daniel, organising agent, North Wales Quarrymen's Union, from Fourcrosses, Chwilog, to [David] Lloyd Humphreys [of Blaenau Ffestiniog, aft. of Pwllheli], 1899 (labour relations in the North Wales slate industry), and twenty holograph letters and post cards from D. R. Daniel, Camberwell, etc., to J[ohn] Lloyd Humphreys, Dolawel, Blaenau Ffestiniog [brother of David Lloyd Humphreys, and quarry manager, etc.], 1918-1930 and undated (books, World War I, an appreciation of [J.] Glyn Davies, the writer's health, the collection of dialect terms, an appreciation of W. Llewelyn Williams, comments on [John Davies] 'Siôn Gymro', parliamentary elections and current politics, the preservation of the Welsh language, observations on [Elfennau Gwleidyddiaeth by J.] Jones Roberts, personal, news of friends, etc.).

Papers, 1974-2003, relating to Pwllfanogl including a copy of a photograph showing employees of the Britannia Slate Works, c. 1890; an undated typewritten list of buildings and dwellings at Pwllfanogl and their occupants; and a typescript list, with some additions in Kyffin Williams's hand, of birds observed at Pwllfanogl, 1974. Also included is a paper by D. C. Jones entitled 'The Pwll Fanog Slate Wreck - Industrial Archaeology under the Sea', which contains notes on the reverse in Kyffin Williams's hand in preparation for a talk on portrait painters together with a short verse.

Ledger and journal of Gaewern Slate works, Machynlleth, 1835-1856; accounts and notebooks of the Ratgoed and Cymerau Slate Quarries, Tal-y-llyn, and Llwyngwern Slate Quarry, Llanuwchllyn, 1853-1899; ledgers and notebook of the Cambrian Slate Works, Machynlleth, 1899-1909; minute books of the Abercorris Slate Quarry Company, Rhiwgwreiddyn, Corris, 1893-1909, and the Towyn Company, Tywyn, 1893-1903; and miscellaneous accounts and ledgers, 1827-1909.

Papurau'r cymdeithasegydd Alwyn D. Rees, 1911-1974, yn cynnwys papurau'n ymwneud â Phrifysgol Cymru, yn bennaf â Choleg Prifysgol Cymru, Aberystwyth, 1920au-1974, gan gynnwys papurau'n ymwneud â'r comisiwn a sefydlwyd i archwilio strwythur ffederal Prifysgol Cymru yn y 1960au; papurau ynglŷn â lle'r Gymraeg yn y Brifysgol a'r ymgyrch i sefydlu neuadd Gymraeg i fyfyrwyr yn Aberystwyth,1967-1974; papurau'n ymwneud â llyfrau, erthyglau a darlithoedd Alwyn D. Rees, 1933-1973, a Chymdeithas yr Iaith Gymraeg, [c.1964]-1974; papurau'n ymwneud â Barn, 1966-1967; papurau'n ymwneud â darlledu yng Nghymru, 1938-1974; papurau'n ymwneud â'r diwydiant llechi yng Nghymru,1946; papurau'n ymwneud â gwleidyddiaeth yng Nghymru, 1911-1974; gohebiaeth gyffredinol, 1935-1974; a phapurau a gohebiaeth bersonol , 1930-1974 = Papers of the sociologist Alwyn D. Rees, 1911-1974, including papers relating to the University of Wales, mainly the University College of Wales, Aberystwyth, 1930s-1974, including papers relating to the commission established to examine the federal structure of the University of Wales in the 1960s; papers concerning the place of the Welsh language in the University and the campaign to establish a Welsh student hostel at Aberystwyth, 1967-1974; papers relating to the University of Malta, 1940-1951; Alwyn D. Rees's research papers, 1933-1973; papers relating to Alwyn D. Rees's books, articles and lectures, and further related research papers assembled by him, 1925-1974; papers relating to the Welsh language, 1952-1974, and 'Cymdeithas yr Iaith Gymraeg', [c. 1964]-1974; papers relating to 'Barn', 1966-1975; papers relating to broadcasting in Wales, 1938-1974; papers relating to the Welsh slate industry, 1946; papers relating to politics in Wales, 1911-1974; general correspondence, 1935-1974; and personal papers and correspondence, 1930-1974.