Letter from Sotheby, Charles, Adm. to his father William Sotheby (2 pieces), 25 September 1798, Box: 3, Folder: 4B:71. Sotheby Family Papers, MS 4. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/261905 Accessed May 17, 2024.