Papers include: Letters to Duffy from various correspondents, including literary and political figures, from 1840-1902 including: Thomas O'Shea, W.S. O'Brien, Thomas Carlyle, Rober Lowe, Sir Redmond Barry, Sir Henry Parkes, Sir George Bowen, Lord Carnarvon and J Henniker Heaton. Correspondence 1842-92 between members of Duffy's circle and an account by Fred Lucas on his visit to Rome in 1855. Documents relating to the publication of Duffy's works include a cutting with author's amendments of an article by Duffy, "Half a century of boons to ungrateful Ireland". Documents concerning Duffy and Young Ireland, including a poem by Charles Kickham and accounts by Richard O'Gorman and T.B. MacManus of the Rising of 1848.