Letter from [Algernon Percy, 4th duke of Northumberland, also known as "Lord Prudhoe"], September 4, [18--] (circa 1800-1842) (Stanwick), Box: 23, Folder: 11. Letters, literary manuscripts, and personal papers of the Porter family, MS 28. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/467128 Accessed May 05, 2024.