Papurau Gerallt Jones,1902-1981, yn cynnwys yn bennaf copïau llawysgrif a theipysgrif o'i farddoniaeth a'i rhyddiaith,1937-1981, llawer ohonynt wedi'u cyflwyno i gystadlaethau yn y Genedlaethol ac eisteddfodau eraill, ynghyd â'i ohebiaeth,1952-1982, a hefyd deunydd yn ymwneud â theulu llenyddol 'Y Cilie', yn cynnwys barddoniaeth a rhyddiaith gan y Parch. Fred Jones,1902-1932, y Parch. Simon B. Jones, 1934-1955, ac aelodau eraill o'r teulu, yn ogystal â llythyrau a chardiau,1956-1970, oddi wrth Dafydd Isfoel Jones a Jac Alun Jones = Papers of Gerallt Jones, 1902-1981, consisting mainly of manuscript and typescript copies of his poetry and prose, 1937-1981, much of which was entered for competition at National and other eisteddfodau, together with his correspondence, 1952-1982, and also material relating to the literary family of 'Y Cilie', including poetry and prose by the Rev. Fred Jones, 1902-1932, the Rev. Simon B. Jones, 1934-1955, and other members of the family, as well as letters and cards, 1956-1970, from Dafydd Isfoel Jones and Jac Alun Jones.

Llythyrau, 1915-1936, yn bennaf at ei deulu tra bu'n gwasanaethu yn y fyddin, 1915-1919; teipysgrifau a llawysgrifau o'i ddramâu a sgriptiau radio, 1920-1936, a thorion papur newydd o adolygiadau, 1926-1940; barddoniaeth, caneuon, parodïau, rhyddiaith a deunydd arall, 1924-1932; copi teipysgrif o 'Ann y Wernolau',drama gan ei fam, Mrs Teifi Jones, 1921; a deunydd amrywiol a ychwanegwyd gan D. Gwenallt Jones tra bu'n ymchwilio ar gyfer Cofiant Idwal Jones, 1934-1957. = Letters, 1915-1936, mainly to his family whilst serving in the army, 1915-1919; typescripts and manuscripts of plays and radio scripts, 1920-1936, and newspaper cuttings of reviews, 1926-1940; poetry, songs, parodies, prose and other material, 1924-1932; a typescript copy of 'Ann y Wernolau', a play by his mother, Mrs Teifi Jones, 1921; and miscellaneous material added by D. Gwenallt Jones while researching <i>Cofiant Idwal Jones</i>, 1934-1957.

Derbyniwyd bocs ychwanegol o bapurau gan Mrs Eirain Rees (nee Jones), Medi 2008. Mae'r grŵp yn parhau heb ei gatalogio.