Photocopies and transcripts of correspondence between Willa Muir and various correspondents collected by Peter Butter., Circa 1970-1999., Acc.13634/41. 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/15346 Accessed April 26, 2024.