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See Peter Bartrum, http://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5548/OSBWRN%2... (April 8, 2017; Anne Brannen, curator)
Please see Peter Bartrum: Iorwerth Goch (A); https://www.geni.com/documents/view?doc_id=6000000173409183982 & Osbwrn 1 (A1); https://www.geni.com/documents/view?doc_id=6000000173426918009 (Steven Ferry, December 27, 2023.)