in three series. The first series, consisting of four volumes, numbered 1 – 4, appeared in 1848 and 1849 under the title Memoirs and Correspondence. The volumes are not marked "first series on the title pages. They are: Memoirs and Correspondence of Viscount Castlereagh, Second Marquess of Londonderry, Volume 1 (London: Henry Colburn, 1848) online at Internet Archive - The Irish Rebellion Memoirs and Correspondence of Viscount Castlereagh, Second Marquess of Londonderry, Volume 2 (London: Henry Colburn, 1848) online at Internet Archive - Arrangements for a Union Memoirs and Correspondence of Viscount Castlereagh, Second Marquess of Londonderry, Volume 3 (London: Henry Colburn, 1849) online at Internet Archive - Completion of the Legislative Union Memoirs and Correspondence of Viscount Castlereagh, Second Marquess of Londonderry, Volume 4 (London, Henry Colburn, 1849) online at Internet Archive - Concessions to Catholics and Dissenters: Emmett's Insurrection The second series, consisting of four volumes, appeared in 1851 under the title Correspondence, Despatches and Other Papers. The volume numbers continue, despite being marked "2nd series" and are therefore 4 to 8. They are: Correspondence Despatches and Other Papers of Viscount Castlereagh, Second Marquess of Londonderry, Series 2, Volume 5 (London: William Shoberl, 1851) online at Internet Archive - Military and Miscellaneous Correspondence Despatches and Other Papers of Viscount Castlereagh, Second Marquess of Londonderry, Series 2, Volume 6 (London: William Shoberl, 1851) online at Internet Archive - Military and Miscellaneous Correspondence Despatches and Other Papers of Viscount Castlereagh, Second Marquess of Londonderry, Series 2, Volume 7 (London: William Shoberl, 1851) online at Internet Archive - Military and Miscellaneous Correspondence Despatches and Other Papers of Viscount Castlereagh, Second Marquess of Londonderry, Series 2, Volume 8 (London: William Shoberl, 1851) online at Internet Archive - Military and Miscellaneous The third series appeared in 1853. The four volumes have the same title as the second series. The volume numbering is irregular. They are: Correspondence Despatches and Other Papers of Viscount Castlereagh, Second Marquess of Londonderry, Volume 9 (London: John Murray, 1853) online at Internet Archive - Military and Diplomatic Correspondence Despatches and Other Papers of Viscount Castlereagh, Second Marquess of Londonderry, Volume 11 (London: John Murray, 1853) online at Hathi Trust Correspondence Despatches and Other Papers of Viscount Castlereagh, Second Marquess of Londonderry, Series 3, Volume 3 (London: John Murray, 1853) online at Internet Archive - Military and Diplomatic Correspondence Despatches and Other Papers of Viscount Castlereagh, Second Marquess of Londonderry,