The layout of the pages of images does not always allow space for the type of denomination of a chapel or church, and so shortened forms have been used in several places, where this information is known. Most of the churches shown in the website are Church of England [Protestant].
| Abbreviations used for church or chapel denomination. | |
| BC | Bible Christian |
| Calv. Meth or CM | Calvinistic Methodist (Presbyterian) |
| Prim. Meth | Primitive Methodist |
| Wesley | Wesleyan Methodist |
| WM | Welsh Methodist |
| Repositories mentioned on this website where abbreviations are used. | |
| GRO/GA | Glamorgan Record Office, Cardiff [ now Glamorgan Archives] |
| WGA | West Glamorgan Archive Service |
| GWENT RO | Gwent Record Office |
| MTL | Merthyr Tydfil Central Library |
| NLW | National Library of Wales, Aberystwyth |
| TNA | The National Archives |