Papurau Selyf Roberts, yn cynnwys erthyglau, 1947-1976; drama deledu,1982; sgyrsiau, darlithoedd a phregethau, 1950au-1980; gohebiaeth a dderbyniodd, 1951-1994; a thorion papur newydd, 1883-1964. = Papers of Selyf Roberts, including articles, 1947-1976; television drama, 1982; talks, lectures and sermons, 1950s-1980; correspondence received, 1951-1994; and newspaper cuttings, 1883-1964.

Gohebiaeth 'Alaw Ddu', 1870-1904; copïau llawysgrif o'i gyfansoddiadau cerddorol, yn cynnwys alawganau, 1878-1901, anthemau,1875-1903, emynau,1865-1895, caneuon crefyddol,1875-1896, caneuon seciwlar, 1879-[c. 1900], a darnau cerddorfaol, 1889-1899; ac eitemau amrywiol, 1879-1894 = Correspondence of 'Alaw Ddu', 1870-1904; manuscripts of his musical compositions, comprising cantatas, 1878-1901, anthems, 1875-1903, hymns, 1865-1895, religious songs, 1875-1896, secular songs, 1870-[c. 1900], and orchestral pieces, 1889-1899; and miscellaneous items, 1879-1894.

Copi o’r gyfrol Y Bugail Da: Cantata’r Ysgol Sul gan W. T. Rees (Alaw Ddu) (Llundain, 1892), ynghyd â thorion papur newydd yn ymwneud â'r cyfansoddwr ac arweinydd, a’i fab, Gwilym T. Rees (Ap Alaw Ddu), a ffotograff o’r olaf gyda’i wraig; Mai 2024.

Teipysgrif traethawd gan awdur anhysbys, 1945, yn dwyn y teitl 'Emynwyr ac Emynyddiaeth yr Hen Ymneilltuwyr Cymreig (Annibynwyr, Bedyddwyr, Undodiaid) hyd at 1811', wedi ei ysgrifennu o dan y ffug-enw 'Piwritan' ar gyfer cystadleuaeth Gwobr Goffa Ieuan o Leyn yn Eisteddfod Genedlaethol Cymru Rhosllannerchrugog, 1945. = Typescript essay by an unnamed author, 1945, on the hymns and hymn writers of the Congregationalist, Baptist and Unitarian denominations in Wales to 1811, written under the pen-name 'Piwritan' for the 1945 National Eisteddfod in Rhosllannerchrugog.
Rhestrir y cynnwys ar ff. iv-v. Mae llythyr cyflwyno, [1956], oddi wrth y gwerthwr wedi ei bastio tu mewn i'r clawr blaen. = The contents are listed on ff. iv-v. A covering letter, [1956], from the seller is pasted in on the inside front cover.

A collection of hymn-tunes and chants made by David Lewis, 1839. Most of the tunes are unsigned. Signed tunes include works by William Pugh and T[homas] Jarman. Some of the titles have territorial significance, e.g. 'Corus Llanrhystid' and 'Difyrrwch Plant Carno'.

A collection of hymn-tunes arranged and harmonised by David Lewis, 1856.

The tune book of Rowland Jenkins Richards, Llangwyryfon, containing hymn-tunes and psalm-tunes, with notes by David Lewis.

A book of hymn-tunes and psalm-tunes, mainly by John Williams, Dolgellau ['Ioan Rhagfyr'], together with Welsh airs: 'Difyrrwch Gwŷr y Gogledd', 'Cân hen Ŵr y Cwm' and 'Cwymp Llewelyn'.

A small collection of hymn-tunes by R[ichard] Mills ['Rhydderch Hael'], David Lewis, William Williams, Abertawe [and Caernarfon] and others.

A part of a notebook containing a number of hymns, all of which were published in 1767 in Golwg ar Ddull y Byd hwn yn myned heibio.

Two volumes of sermons, hymns, poems, and memoranda, written in 1827-1828 and 1835-1836 by David Saunders, Baptist minister, poet, and hymn-writer, with transcripts by him of a few poems by other writers.

'Cywyddau' by Edwart ap Raff, Dafydd Llwyd ap Llywelyn ap Gruffudd, Huw ab Elis, Robert ab Ieuan ap Tomos, Humphrey Thomas Gruffudd, Sion Phylip, Tomos Penllyn, Maredudd ap Rhys, Wiliam Llyn, Sion Tudur, Rhys Cain, Morys Cyffin, William Byrchinshaw, Robin Clidro, Morys ab Ieuan ab Einion, and Guto'r Glyn; 'englynion' transcribed by Edward Lloyd in 1747 from 'Llyfr Maelor'; and fragments of hymns by William Williams (Pantycelyn) and others.

Anthems and hymn-tunes, including 'Anthem angladdawl mewn coffadwriaeth am y diweddar Barch. John Elias, Môn' by Richard Mills [Rhydderch Hael], 'Seion, y geiriau gan y Parch W[illiam] Ambrose', 'Prynedigaeth', and 'Cwymp Meddwdod' by J[ohn] Ambrose Lloyd, 'Mawl yn Seion' by W. Matthews, and anthems on biblical themes by W[illiam] Owen, Foulk Roberts, and others.

Anthems, psalm-tunes and hymn-tunes, including 'Margareta' and 'Llawenydd yn yr Afon' by the Reverend John Jones, Tal-y-sarn.

A book of hymn-tunes and psalm-tunes compiled by Thomas Jones, Newhavren at the age of twenty ('Thomas Jones pia fi/a dig a fydd os dygir fi'). It contains tunes by Isaac Williams, Aberaeron, William Jones and Richard Roberts, Llandrygarn, arrangements by David Hughes ['Cristiolus Môn'], Bodedeyrn, an 'Anthem Gron - Ple mae'r Iesu', and a large number of unsigned tunes.

The tune book of John Hughes, Llaindelyn, Llanddeusant, Anglesey, containing hymn-tunes and anthems by David Harri[e]s and others unnamed, and a small collection of hymns and temperance songs.

'Hymnau o Fawl i Dduw' written by Evan Lewis, Carmarthen, 1798; poems by Evan Lewis, Rees Jones ['Amnon'], I. Thomas, R. Davies, 'Ioan Machno' [John M. Price], 'Britwn' [Edwin Foulkes], 'Eryr Trichrug', 'Meudwy', 'Dewi Glan Ffrydlas' [David E. Davies], 'Telynog' [Thomas Evans], 'Talhaiarn' [John Jones], 'Gwerydd Gwyllt' [Evan W. Jones], John Jones and Richard [Rhisiart] Phylip; 'englynion'; miscellaneous notes on Unitarians and Unitarianism.

Addresses by Meredith J. Hughes on 'Myth and legend in the literature of Wales', 1914, and 'Democratic Theory and Institutions', 1919; a hymn 'Ymwel a mi o Arglwydd da', and a poem entitled 'Afon Alun', 1924.

Transcripts by Owen Jones from Volume One of a collection of Latin hymns edited by H. A. Daniel and published at Halle, 1841-1846, and of notes by D. Silvan Evans and Lewis Edwards, published in Bye-gones, 1879, relating to the authorship of the Welsh hymn beginning 'Myfi yw'r Adgyfodiad mawr'.

The tune book of John Roberts, Llanegryn, 1826, and later of Bontdolgadfan, containing anthems, hymn-tunes and psalm-tunes by John Roberts, Pantyniwl, John Williams, Abermawddach, H[ugh] Jones, Maesglasau, W. Williams, Llanegryn, John Edwards, Llangadog, the Reverend Richard Phillips, Bala, John Roberts, Llanbrynmair and others; and a hymn for use in Sunday Schools ('Yn ysgol bur fy Nuw').

A volume of sermon notes, in different hands, belonging on 28 April, 1825, to David Arthur of Pantycelyn, later co-pastor of Builth Baptist Church. Pages 1-74 are described in a colophon as 'cyfieithiad pigion o Gyfansoddiad Saesnig' (translations of selections from English compositions) by Josiah Evans (d. 1792), pastor of Pantycelyn Baptist Church. At the beginning and the end and in occasional blank spaces in the volume are written Welsh hymns, and there is at the end also a list of the sermons comprised in pages in pages 1-88. On page 109 is recorded the marriage of Rees Arthur [son of David Arthur] and Ann Arthur, his wife, 5 December, 1851.