1. Photographs of Bethel Chapel, Llansamlet and its ministers and deacons, c. 1870s-2022
2. Adroddiadau blynyddol (annual reports), 1941-2021
3. Minutes of church meetings, deacons' meetings and church committees, 1877-1999
4. Records relating to members leaving Bethel, Llansamlet, 1925-2015
5. Registers of church members and their attendances and contributions, 1887-2017
6. Cash books recording receipts and payments, 1895-2013
7. Records relating to the graveyard and garden of remembrance, 1930-2021
8. Records relating to church fabric, property and trusteeship, 1882-2020
9. Orders of service and programmes for events relating to the history of Bethel, Llansamlet, its ministers and members, 1929-2016
10. Tape recordings of services and sermons at Bethel, Llansamlet, 1972-1988
11. Written, typed and printed histories of Bethel Chapel, Llansamlet, 1885-1980
12. Plans of services, 1980-2001