Sir George Clerk [of Penicuick, 6th bart (1787-1867)], 2 Brook Street, [London], to John Spottiswoode Esqr, 40 Sackville Street, Piccadilly, [London], June 2, 1812, Box: 1, Folder: 13. Spottiswoode & Robertson collection, MS 186. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/248808 Accessed December 11, 2024.