Portions of two letters, 1865, from John Jones (Talhaiarn) (1810-1869) written from London, when he was assisting in the Crystal Palace planning, to W. W. P. Williams, and relating to the proposed colonisation of a part of Patagonia by Welshmen; also a part of a letter from W. W. P. Williams to Talhaiarn on the same subject.

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and press cuttings on the history, culture and industry of Patagonia, 1869-1962; and typescripts of published and unpublished works, lectures, scripts, etc.

Photocopies from the memorandum book, 1865-1916, of Richard Ellis [originally from Llanfechain, Montgomeryshire], who sailed aboard the Mimosa to Patagonia in 1865, and a photocopy from a newspaper of an article in Spanish relating to the diary.

Copi o sgwrs a luniwyd yn wreiddiol gan Glenys Jones ar achlysur dathlu canmlwyddiant sefydlu'r Wladfa yn 1965 ond a addaswyd ar ôl ei marwolaeth yn 2004. Ymfudodd i Lerpwl o Batagonia a bu'n siarad gyda gwahanol gymdeithasau yng Nglannau Mersi am ei hatgofion o'i mamwlad.

Dau lythyr, 1950, oddi wrth Thomas Rowlands, Tyddyn Morlais, y Gaiman, Chubut, a ymfudodd i Batagonia ym 1906, ynghyd â llungopi o ffotograff o Côr y Dyffryn Uchaf, côr a sefydlodd ym 1925.