Correspondence of the 8th Marquess of Tweeddale concerning the tile-making enterprise, being chiefly letters of partners and lawyers and including many letters of John Richard Birnie., 1838-1840, undated., MS.14463. Papers of the Hays of Yester formerly preserved at Yester House., MSS.14401-14827. National Library of Scotland Archives and Manuscripts Division. https://nlssb.as.atlas-sys.com/repositories/2/archival_objects/35889 Accessed September 25, 2024.