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See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/4941/gollwyn... (October 7, 2020; Anne Brannen, curator)
See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/4737/Bleddyn... (March 23, 2017; Anne Brannen, curator)