Interrogations relating to the case in Chancery of Billings v. Blackwood concerning "The Baronial and Ecclesiastical Antiquities of Scotland"., 1860, MS.30074, folios 80-84. Papers of William Blackwood and Sons., MSS.30001-30984. National Library of Scotland Archives and Manuscripts Division. https://nlssb.as.atlas-sys.com/repositories/2/archival_objects/33819 Accessed September 23, 2024.