Letters of and for the 4th Marquess, chiefly drafts in his own hand or copies., September-December 1745, November-December 1756, MS.7078. 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/18147 Accessed September 24, 2024.