The collection consists of letters written to Gwylfa by various correspondents, 1894 - 1935 and letters written by him to others, some of which include written adjudications for Eisteddfod competitions, 1904 - 1934.
The essays and lectures cover a variety of subjects and some have obviously been composed for entry in competitions. There are also essays prepared by Gwylfa for publication in Y Diwygiwr and Y Dysgedydd. Some biographical works are also included.
The winning poem in the National Eisteddfod held in Cardiff in 1899 is to be found amongst the poetry of Gwylfa.
There are sermons by Gwylfa and by other preachers.
The personal and family items include diaries which range from 1898 to 1929, newspaper cuttings, notes on family history and tenancy agreements.
Amongst the miscellaneous items there are adjudications, notes on Llanelli, minutes of the Tabernacl Chapel, Llanelli and the Gorsedd Diary for 1934 composed by Gwylfain his capacity as Recorder of the National Eisteddfod.
The papers of Rev. Rhys Jones Huws include letters by him to Gwylfa, Eisteddfod programmes and poetry.