Althorp Papers. Vol. dcxcvi. Letters from Col. George Vigoureux, Goveror of Scilly; 1798-1819. Colonel George Vigoureux, Governor of Scilly: Letters to Lord Spencer: 1798-1819.
Althorp Papers. Correspondence with Archibald Philip Primrose, 5th Earl of Rosebery, Lord Privy Seal (1885), Foreign Secretary (1886, 1892-1894), Prime Minister (1894-1895); 1881-1907. Archibald Philip Primrose, 5th Earl of Rosebery: Correspondence with 5th Earl Spencer: 1881-1907.
Althorp Papers. Vol. mdcxxv. Correspondence with Joseph Chamberlain, President of the Board of Trade (1880-1885); 1880-1887. For original index see KS498. Joseph Chamberlain, PC; MP: Correspondence with 5th Earl Spencer: 1880-1887.
Althorp Papers. Vol. mdclxxix. Correspondence with C. R. Barry, Attorney-General Ireland, (1870-1872); 1869-1884, 1892, n.d. For original index see KS465. Charles Robert Barry, Irish judge: Correspondence with 5th Earl Spencer: 1869-1892, n.d.
Althorp Papers. Vol. mdcclxxxvi. Correspondence with Col. Robert Bruce, Inspector General of the Royal Irish Constabulary; 1881-1885. Colonel Robert Bruce, Chief Constable of Lancashire: Correspondence with 5th Earl Spencer: 1881-1885.