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See Peter Bartrum, http://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5158/OSBWRN%2... (April 28, 2017; Anne Brannen, curator)
Please see Peter Bartrum: Maelog Crwm 2 (A); https://www.geni.com/documents/view?doc_id=6000000173426996939 & Osbwrn 2 (E); https://www.geni.com/documents/view?doc_id=6000000173426904928 (Steven Ferry, April 3, 2024.)