Doctoral thesis ‘A Textual and Biographical Study of the Poems of Edwin Muir’ by Robert B Hollander of the University of Columbia., 1962., Acc.13634/55. 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/15309 Accessed May 09, 2024.