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See Peter Bartrum https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5648/Cydifor... (December 8, 2020; Anne Brannen, curator)
See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/4982/aleth%2... (December 15, 2016; Anne Brannen, curator)