Althorp Papers. Vol. dclxxxii. Letters from Margaret, Countess of Lucan, mother-in-law of Lord Spencer, concerning family matters and the administration of her estate; 1781-1815 Margaret Bingham, wife of Richard, 1st Earl of Lucan: Letters to Lord Spencer: 1781-1815.
Althorp Papers. Vol. mdclxxxiii. Correspondence with Sir Lyon Playfair, 1st Baron Playfair of St. Andrews, Secretary for Science in the Dept. of Science and Art (1853-1855), Secretary for Science and Art (1855-1858), Postmaster-General (1873-1874), Chairman and Deputy Speaker of the House of Com...
Althorp Papers. Vol. mdccli. Correspondence with Stephen Edward Spring Rice, Treasury official, relating to Dublin Museums, vice-regal expenses, etc.; 1882-1885. Stephen Edward Spring-Rice, of the Treasury; CB 1895: Correspondence with 5th Earl Spencer: 1882-1885.
Althorp Papers. Vol. mdcclxxiv. Correspondence with Sir William Rose Mansfield, 1st Baron Sandhurst, Commander in Chief of the forces in Ireland (1870-1875); 1870-1873. For original index see KS486. William Rose Mansfield, 1st Baron Sandhurst: Correspondence with 5th Earl Spencer: 1879-1873.
Althorp Papers. Vol. mdcclxxxii. Correspondence with Col. F. F. Maude, Inspector General of Irish Militia; 1870-1872. Colonel F. F. Maude, Inspector General of Irish Militia: Correspondence with 5th Earl Spencer: 1870-1872.