- NLW MSS 2728C, 2729-2731B, 2732C, 2733B, 2734E.
- Ffeil
- [1793], [1851]
The original manuscript and author's drafts of 'Cywydd y Drindod' by David Richards (Dafydd Ionawr) and a transcript of the poem, with an introduction prepared for the press.
Richards, David, 1751-1827