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See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/6276/GUNTER%... (April 10, 2019; Anne Brannen, curator)
See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5394/BREDWAR... (March 6, 2018; Anne Brannen, curator)
See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5218/BLEDDYN... (December 11, 2017; Anne Brannen, curator)