Holt parish register, image from http://news.bbc.co.uk/local/northeastwales/hi/people_and_places/newsid_9396000/9396912.stm
The Phillimore Atlas and Index of Parish Registers provides parish maps within North, Central and South Wales and includes colored lines showing the boundaries of each diocese.
Copied from Family history : the journal of the Institute of Heraldic and Genealogical Studies FHL book# 942 B2f v. 19, no. 153 Oct. 1997
Llangiwg, Glamorgan parish register, DGS number 425328, image 18
Book: Parish Registers of Wales lists surviving parish registers.