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See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/4817/COWRYD%... (August 22, 2020; Anne Brannen, curator)
See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/6479/SALESBU... (April 5, 2017; Anne Brannen, curator)