[Archibald Kennedy, 1st marquess of] Ailsa [and 12th earl Cassillis (1770-1846)], to Dear sir, December 7, 1836, Box: 1, Folder: 51. Spottiswoode & Robertson collection, MS 186. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/248846 Accessed March 02, 2025.