Papurau'n ymwneud â Rhieni dros Addysg Gymraeg, 1963-1988, yn cynnwys copïau o gofnodion, 1963-1988, y Cyfarfodydd Cyffredinol Blynyddol a chofnodion y Pwyllgor Gwaith; adroddiadau blynyddol, 1984-1988; copi o gyfansoddiad y grŵp a luniwyd yn 1983; gwahanol adroddiadau a baratowyd gan y grŵp, 1983-1988; ac adroddiadau a baratowyd gan bwyllgorau sir y mudiad, 1981-1987. = Papers relating to Rhieni dros Addysg Gymraeg1963-1988, including copies of minutes, 1963-1988, of the AGMs and the executive committee minutes; annual reports, 1984-1988; a copy of the group's constitution prepared in 1983; various reports prepared by the group, 1983-1988; and reports prepared by the movement's county committees, 1981-1987.

Papurau ychwanegol gan gynnwys papurau'r Gynhadledd Flynyddol, 1983-1987; cyfrol yn cynnwys cyfansoddiad 'Undeb Rhieni Ysgolion Cymraeg', a chofnodion cyfarfodydd, 1963-1982; a papurau Taflen 'Holi ac Ateb'. Nid yw'r papurau hyn wedi eu catalogio eto.

Mae'r casgliad yn cynnwys ysgrifau yn dwyn y teitl 'Yr Hen Ysgol - 1864-1867', sy'n cyfeirio at ddefnydd o'r 'Welsh Not'; llyfrau nodiadau a gadwyd gan William Williams,1871-1888, yn cynnwys nodiadau ysgrythurol; ysgrifau heb ddyddiad; llyfr nodiadau yn cynnwys adroddiad heb ddyddiad am ordeinio'r Parch. D. R. Jones yn weinidog Bethania, Llanelli; a ffotograffau, ynghyd â manylion bywgraffyddol am aelodau o'r teulu Williams, ynghyd â darlith perthynol gan Eluned Jones. = The collection comprises writings entitled 'Yr Hen Ysgol - 1864-1867', referring to the use of the 'Welsh Not'; notebooks kept by William Williams, 1871-1888, containing scriptural notes; undated writings; a notebook containing an undated report of the ordination of Rev. D. R. Jones at Bethania, Llanelli; and photographs, together with biographical details, of members of the Williams family, together with a related lecture by Eluned Jones.

Correspondence, papers and printed items, 1994-1995, concerning the proposal that Charles, Prince of Wales might become an honorary member of the Gorsedd, the proceedings of the Prince of Wales Committee, the creation of a new environmental trust for Wales by Charles, Prince of Wales, and the preparation in 1994 of a short article by Sir Goronwy Daniel on 'The 1967 Welsh Language Act and the Investiture of the Prince of Wales in 1969'. The correspondents include Lord Cledwyn, 1994, Lord Gwilym Prys-Davies (2), 1994, and Professor Ieuan Gwynedd Jones, 1994.

Printed items, typescripts, press cuttings, and some letters, 1963-1994, on the Welsh language. They include material on the 1963 Report of the Council for Wales and Monmouthshire, teaching through the medium of the Welsh language in the University of Wales, parliamentary debates on the status of the Welsh language, broadcasting, bilingual road signs, the use of the Welsh language in the law courts, the Welsh language and the education system, the 1971 Census, publishing in the Welsh language, and Welsh language television.