Deunydd a grynhowyd gan John Roberts, trefnydd ac ysgrifennydd cyffredinol yr Eisteddfod Genedlaethol, yn ymwneud yn bennaf â dathlu canmlwyddiant y Wladfa yn 1965, gan gynnwys llythyrau at y rhoddwr am y 'bererindod i Batagonia' a drefnwyd gan Undeb Cymry Ariannin ac ag ymweliad chwech ymwelydd o Batagonia i Gymru y flwyddyn honno. Ceir llyfr lloffion yn cynnwys ffotograffau yn ymwneud â’r daith i'r Wladfa a llungopi o erthygl Lewis H. Thomas, 'From the pampas to the prairies. The Welsh migration of 1902', a gyhoeddwyd yng nghylchgrawn Saskatchewan History.

Papers of David Richards, 1886-1894, including letters, 1891-1894, to his wife, describing his voyage and stay in the settlement; journal consisting of loose leaves of the journey to Cwm Hyfryd, Patagonia, September 1891 to January 1892; journal of the voyage home from Buenos Aires to Plymouth, July-August 1892; copies of Welsh poems transcribed and possibly composed by David Richards, proofs of, or cuttings containing, parts of a series of articles on 'Cyfoeth Mwnawl y Wladfa Gymreig' to Y Celt in 1891, and a printed copy of a report on the Garn Gold Mine near Dolgellau, 1888.

Teipysgrifau o ddyddiaduron gŵr o'r enw William Williams o'i deithiau yn y Wladfa, rhwng 1889 a 1895. Trefnwyd y gwaith gan Glyn Williams o Goleg Prifysgol Gogledd Cymru, Bangor, ym 1976, ac fe dalodd Llyfrgell Genedlaethol Cymru i Irma Hughes de Jones, y Wladfa, wneud y gwaith teipio o'r dyddiaduron gwreiddiol.

Journals for the period 1889-1897, with gaps, of William Thomas Williams, Gaiman, Chubut, Patagonia, mostly describing expeditions to the Andean sector of Chubut to explore the settlement potential of the region.

Letter, 15 November 1968, from Kyffin [Williams] in Gaiman, Patagonia, to his friend the painter Gwyn Brown and her husband Harry, Tegfryn [Art Gallery], Menai Bridge, Anglesey, containing observations on the scenery and people, the weather, the challenging conditions for painting and the difficulties of communicating in Welsh and Spanish.
Williams was in Patagonia from October 1968 to early 1969 on a Fellowship awarded by the Winston Churchill Memorial Trust. The letter was published in David Meredith and John Smith, Obsessed: The Biography of Sir Kyffin Williams (Llandysul, 2012), pp. 134-5.

Notebook in Welsh of James Jones (father of Captain Francis Jones, Herald Extrordinary of Wales) including 'Darlith ar Batagonia', written at the beginning of the twentieth century, whilst living in the country for eight years as a young man, together with an English translation by John Roach, grandson of James Jones's brother. = Llyfr nodiadau James Jones (tad yr Uwchgapten Francis Jones, Herald Extraordinary of Walesar daith ), yn Gymraeg, wedi'i ysgrifennu ar ddechrau'r ugeinfed ganrif pan fu'n byw yno am gyfnod o wyth mlynedd, gan gynnwys 'Darlith ar Patagonia', a chopi o gyfieithiad i'r Saesneg ohoni gan John Roach, ŵyr i frawd James Jones.

Nodiadau darlithoedd, yn bennaf ar gyfer dosbarthiadau allanol ar hanes Cymru, 1943-1975; papurau ynglŷn ag ymchwil a chyhoeddiadau Frank Price Jones, 1947-1975, yn cynnwys drafftiau erthyglau ac adolygiadau, gwahanlithoedd a chopïau printiedig o'i waith cyhoeddedig; deunydd yn ymwneud ag erthyglau awduron eraill, 1932-1975; papurau, 1943-1975, yn deillio o waith Frank Price Jones ar gyfer y cyfryngau, y cynnwys sgriptiau radio a theledu, ac i bapurau newydd; papurau gwleidyddol, 1910-1975, yn cynnwys gohebiaeth, torion o'r wasg, pamffledi ymgeiswyr ac anerchiadau etholiadol, canlyniadau etholiadau, deunydd yn ymwneud ag Ymgyrch Senedd i Gymru yn y 1950au cynnar a Chomisiwn y Cyfansoddiad, 1969-1970; papurau, 1947-1975, ynghylch y gwaith cyhoeddus a gyflawnodd Frank Price Jones, yn cynnwys deunydd yn ymwneud â'r Eisteddfod Genedlaethol, 1922-1974; deunydd, 1966-1975, yn ymwneud â Phatagonia; papurau,1966-1975, yn deillio o waith Frank Price Jones ar gyfer Panel Cyfieithu'r Swyddfa Gymreig, Pwyllgor Amgueddfa Werin Cymru, 1956-1967, ac Urdd y Graddedigion Prifysgol Cymru, 1963-1975; gohebiaeth gyffredinol, 1941-1975, yn cynnwys grŵp mawr o lythyrau,1941-1975, oddi wrth Iorwerth C. Peate, cefnder Frank Price Jones; ac amrywiol. = Lecture notes mainly for extra-mural classes in Welsh history, 1943-1975; papers concerning Frank Price Jones's research and publications, 1947-1975, including drafts of articles and reviews, offprints and printed copies of his published work; material relating to articles by other authors, 1932-1975; papers, 1943-1975, deriving from Frank Price Jones's work for the media, including television and radio scripts, and for newspapers; political papers, 1910-1975, including correspondence, press cuttings, candidates' pamphlets and election addresses, election results, material relating to the Parliament for Wales Campaign of the early 1950s and to the Commission on the Constitution of 1969-1970; papers, 1947-1975, concerning the public work undertaken by Frank Price Jones, including in relation to the National Eisteddfod, 1922-1974; material, 1966-1975, relating to Patagonia; papers, 1966-1975, deriving from Frank Price Jones's work for the Welsh Office Translation Panel, the Committee of the Welsh Folk Museum, 1956-1967, and for the Guild of Graduates of the University of Wales, 1963-1975; general correspondence, 1941-1975, including a large group of letters, 1941-1975, from Iorwerth C. Peate, a cousin to Frank Price Jones; and various miscellanea.