found: Fel y brefa'r hydd: anthem: psalm xlii. 1-5, [18--]:t.p. (John Thomas, Llanwrtyd)
found: Dictionary of Welsh biography down to 1940, 1959:p.954 (Thomas, John (1839-1921), musician, generally known as 'John Thomas of Llanwrtyd' ...)
found: NLW database, 25 Jan. 2005:(hdg.: Thomas, John, 1839-1921; usage: John Thomas; J. Thomas; John Thomas, Llanwrtyd)
found: Dictionary of Welsh Biography, viewed 16 December 2021:(JohnThomas, 1839-1921, born at Blaenannerch (Blaenanerch), moved in 1871 to Llanwrtyd)
found: Canig ddirwestol Datod mae rhwymau caethiwed, 1863?:caption (by "Rhodri", that is, Mr J. Thomas, Blaenanerch)
