General letter book of T and A Constable, containing wet-press copies of general outgoing correspondence of the firm., April-August 1920., MS.23325. Letter books, correspondence and other records of the printing firm of T and A Constable, Edinburgh, together with records of the Edinburgh Press, which was amalgamated with the firm in 1936., MSS.23237-23617. National Library of Scotland Archives and Manuscripts Division. https://manuscripts.nls.uk/repositories/2/archival_objects/56658 Accessed April 25, 2024.