Letters from Mayo can be found in the Duke of Cambridge Papers, MS.Add.8782, and the Duke of Marlborough Papers. Other collections of Mayo's papers can be found at: India Office Collection Burne Collection, MSS Eur D 951 Owen Tudor Burne was Mayo's private secretary. This collection covers the whole of Burne's working life, and includes material relating to Mayo's administration. There are a few letters to Mayo himself, from Indian rulers, Lord Lawrence and Sir Stafford Northcote; also some official letters written by Burne on Mayo's behalf, and letters to Burne from Charles Aitchison and John Strachey. There are some memoranda from Mayo's administration, as was as reflections on and eye-witness accounts of his assassination. Argyll Collection, B 380 The Duke of Argyll was Secretary of State for India during Mayo's viceroyalty. This collection consists of 5 substantial letter-books from the years 1869-1870 containing letters received from Mayo. It contains the complete set of enclosures to Mayo's letters, consisting of copies of letters, memoranda, and sometimes maps and plans of buildings. The National Library of Ireland The National Library holds a large collection of personal and political material relating to Mayo's life and work in Ireland and England.