Parish registers are held, at the National Library of Wales and/or Powys Archives for baptisms 1813-1984, marriages 1813-1873, burials 1813-1986 and banns 1826-1862 and 1957-1959.
In 2003 an exhibition was held at the National Library of Wales to celebrate Catrin's legacy, and a short poem was composed in her memory by Menna Elfyn.
The journal has being digitized by the Welsh Journals Online project at the National Library of Wales.
Sidney K. Greenslade (1867–1955), born in Exeter, was the first architect of the National Library of Wales, located in Aberystwyth.
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Giardelli’s work is held in many collections including the Tate, the National Museum of Wales, the National Library of Wales, Contemporary Art Society of Wales, Arts Council of Wales, Museum of Modern Art Wales, Brecknock Museum, Tenby Museum and Art Gallery together with museums and galleries in New York, Dublin, Nantes, Bratislava and Prague.
After his death over two hundred of his manuscript poems and a short verse-play, together with the typescripts of his comprehensive wartime diaries, were deposited at the National Library of Wales at Aberystwyth.
P survives in a single medieval manuscript:
Aberystwyth, National Library of Wales, MS. Peniarth 20, written c.1330, probably at the Cistercian abbey of Valle Crucis (Llanegwestl).
E. D. Jones (1903–1987), Librarian of the National Library of Wales in Aberystwyth, 1958–1969