Correspondence of John Francis Campbell mainly with civil engineers and managers of various collieries and iron works, giving evidence ‘On the Waste in Combustion’., 1866-1869., Adv.MS.51.1.9. 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/16859 Accessed May 22, 2024.