Holograph manuscript of the hymn-tune 'Bryn Calfaria' by William Owen, 1850; four manuscript tune-books and loose manuscript music mostly in the hand of William Owen, including many of his own compositions, (watermark 1825)-[c. 1854]; together with some printed music relating to the composer and photographs relating to the memorial to him erected at Cae Athro in 1913.
Papurau ychwanegol yn ymwneud â'r Parchedig Huw Llewelyn Williams (1904-79), brawd y rhoddwraig, gan gynnwys llyfr lloffion, 1947-64 a heb ddyddiad, yn ymwneud yn bennaf ag ardal Blaenau Ffestiniog, ei rieni, a Chapel Maenofferen; torion o'r wasg, 1952-94, gydag adolygiadau o'i gyhoeddiadau a'r cofiant Gwas yr Achos Mawr (Dinbych, 1992) a luniwyd iddo gan ei fab Meirion Llewelyn Williams; taflen ei gyfarfod sefydlu yn Eglwysi y Fali a Rhoscolyn, 1952; cyfrol yn cynnwys taflenni angladd ei wraig Gaynor Williams ac yntau, 1979; torion o'r wasg o deyrngedau ac ysgrifau coffa iddynt, a ffotograffau teuluol; ynhgyd â Medal Gee a gyflwynwyd i'w mam Margaret Williams yng nghapel Maengwyn, Machynlleth, 1964
Files of correspondence, papers and photographs relating to visits to China in 1992 and 1995, lecturing at Chinese universities on oil painting materials and techniques.
Papers of the Knowling Lentier family, [c. 1920s]-[c. 1930], including address book; correspondence, 1923; slides; and photographs, including one of David Lloyd George, and two of his daughter Lady Olwen Carey-Evans.
Papers of the David Cledlyn Evans, [1878x1940], relating to his geological and antiquarian studies, with particular reference to Carmarthenshire, including a manuscript draft of a history of Carmarthenshire; a draft typescript history of Welsh literature from 519 to 1890; notebooks; transcripts from 'The Black Book of Carmarthen'; drawings; maps; and printed items.
Papers of the Rev. William Rees, 1872-[1930s], including a volume of pryddestau and englynion by William Rees successfully submitted for competition at various eisteddfodau, 1872-1910; and a further six volumes of poetry by Rees; a volume of hymns, 1919-1925; two volumes of writings; and a volume containing a pryddest, 1931, by D. Emrys James ('Dewi Emrys').
Parish records for Crickhowell, comprising five marriage registers, 1944-1997, a banns register, 1971-1994, a service register, 1975-1987, PCC minutes, 1972-1984, and a scrpabook, 1875-1882.