Correspondence of John Francis Campbell with geologists required to give evidence to the Coal Commission ‘On the Probability of Finding Coal under the Permian New Red Sandstone, and other superincumbent strata’, with related printed reports and proceedings., 1866-1869., Adv.MS.51.1.8. 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/16858 Accessed June 13, 2024.