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See Peter Bartrum, http://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5610/Bleddyn%... (December 5, 2017; Anne Brannen, curator)
See Peter Bartrum, http://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5608/Bleddyn%... (November 16, 2017; Anne Brannen, curator)