Castlereagh, Robert Stewart, Viscount, Substance of The Speech delivered by Lord Viscount Castlereagh on 25th May, 1810 upon Mr Grattan’s Motion for a Committee to take into Consideration the Roman Catholic Petitions. To which are annexed, copies of the original documents therein referred to., 1810, Volume: 79. Lord Eldon Manuscript Collection, MSS-056. Manuscripts. https://aspace.ll.georgetown.edu/public/repositories/3/archival_objects/30690 Accessed May 01, 2024.