Selkirk, Thomas Douglas, Earl of, On the Necessity of a more Effectual System of National Defence and the Means of Establishing the Permanent Security of the Kingdom., 1808, Volume: 23. Lord Eldon Manuscript Collection, MSS-056. Manuscripts. https://aspace.ll.georgetown.edu/public/repositories/3/archival_objects/30203 Accessed April 20, 2025.