Geological notes and diagrams, mainly relating to Iceland, which, according to explanatory notes at the beginning, were to be used in a second edition of ‘Frost and Fire’ but remained unpublished., 1861-1867., Adv.MS.50.6.2. Correspondence and papers, including many manuscripts in Gaelic, journals and yearbooks (with many photographs), albums of watercolour paintings and sketches, and experimental notebooks, of John Francis Campbell of Islay (1821-1885), Gaelic scholar and collector of oral tradition, traveller, scientist, official of the royal household and public servant., Adv.MSS.50.1.1-51.2.7. National Library of Scotland Archives and Manuscripts Division. https://manuscripts.nls.uk/repositories/2/archival_objects/16829 Accessed April 25, 2024.