"On the Boiler" available, "Elbow Room" in preparation, 1 p, [1939], Folder: Eb.2, item: 2d, item: 2d.10. Yeats family correspondence, MS 25. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/264998 Accessed May 18, 2024.