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See Peter Bartrum, http://cadair.aber.ac.uk/dspace/bitstream/handle/2160/4705/Bleddyn%... (June 7, 2017; Anne Brannen, curator)
'See Peter Bartrum, http://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5158/OSBWRN%2... (April 28, 2017; Anne Brannen, curator)