Letters of and for the 4th Marquess, chiefly drafts in his own hand or copies., 1738-1744., MS.7075. Correspondence and papers of the Marquesses of Tweeddale, formerly preserved at Yester House., MSS.7001-7120. National Library of Scotland Archives and Manuscripts Division. https://nlssb.as.atlas-sys.com/repositories/2/archival_objects/14737 Accessed September 24, 2024.