Notes of Peter Butter concerning ‘Edwin Muir : Man and Poet’, by Peter Butter., Circa 1960-1989., Acc.13634/13-16. 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/15300 Accessed April 23, 2024.