Lady [Henrietta] Mackenzie [(died 1840) wife of Sir James Wemyss Mackenzie?], 13 Waterloo Place, London, to Messrs Spottiswoode Robertson, Wednesday February 24, 1836, Box: 1, Folder: 58. Spottiswoode & Robertson collection, MS 186. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/248853 Accessed March 02, 2025.