Miscellaneous material collected by Peter Butter relating to his work on Edwin Muir and Willa Muir., 1913-1989., Acc.13634/53-55. Research papers and literary correspondence between Peter Butter and various correspondents relating to his work on Edwin and Willa Muir, William Blake, Francis Thompson and other writers., Acc.13634/1-77. National Library of Scotland Archives and Manuscripts Division. https://manuscripts.nls.uk/repositories/2/archival_objects/15272 Accessed July 27, 2024.