Copies of entries in the `Book of Registry of Copyrights and Assignments` assigning the copyright in various of his works to William Blackwood and Sons., 1852, MS.30010, folios 35-40. 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/28883 Accessed September 23, 2024.