Colonel W[alter] Ph[ilip] Colyear Robertson [died 1818], 38 Newman Street, [London], to David Robertson Esq, Sackville Street, February 13, 1812, Box: 1, Folder: 16. Spottiswoode & Robertson collection, MS 186. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/248811 Accessed March 02, 2025.