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"Index was prepared from an original transcript of the MI's by the Rev. Martin Reed circa 1990" -- T.p. verso.
Edited by M.E. MacSorley.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Monumental inscriptions : Glasbury (Y-Clas-ar-wy) Breconshire : index to monumental inscriptions in St. Peter's Parish Church, Pen-yr-Heol Baptist Chapel, Maes-yr-Onnen Congregational Chapel, Cwm Bach by Philip Bufton. ISBN 1900655004. Published by M.E. MacSorley in 1995. Publication and catalogue information, links to buy online and reader comments.