Althorp Papers. Vols. mdcii, mdciii. Correspondence with Henry Austin Bruce, later Baron Aberdare, Home Secretary (1869-1873), Lord President of the Council (1873-1874); 1866-1872. Mostly relating to Ireland and Spencer's Lord Lieutenancy. For original indexes see KS497. Two volumes.
Althorp Papers. Vols. mdclxxiv, mdclxxv. Correspondence with Sir Edward Sullivan, Attorney-General, Ireland (1868-1870), Master of the Rolls, Ireland (1870-1883), Lord Chancellor, Ireland (1883-1885); 1868-1887. For original index see KS486 and KS505. Two volumes.
Althorp Papers. Vols. mdcciv-mdccviii. Correspondence, including papers, with John Becke and his son Charles Cecil Beck, solicitors and political agents; 1857-1910. Material covers elections and politics mainly as they affect Northamptonshire; also appointments to benefices, magistrates and other local posts, charities, schools, land improvements in Northamptonshire and Norfolk, etc. Five volumes.
Althorp Papers. Vols. mdccxxvi, mdccxxvii. Correspondence with Courtenay Boyle, Private Secretary to Spencer (1882-1885), Assistant Secretary, Local Government Board (1885-1886); 1866-1898. Two volumes.
Althorp Papers. Vols. mdcclxxii, mdcclxxiii. Correspondence with General Sir Hugh Henry Rose, Baron Strathnairn, Commander in Chief of the forces in Ireland (1865-1870); 1868-1871, n.d.
Althorp Papers. Vols. mdcclxxxiii, mdcclxxxiv. Correspondence with Sir Patrick Joseph Keenan, Resident Commissioner of National Education in Ireland; 1871-1894, n.d. Two volumes
Althorp Papers. Vols. mdccxcix, mdccc. Correspondence with Sir John Fretcheville Dykes Donnelly; Assistant Secretary of Science and Art Dept. (1881-1884); Head of the Dept. (1884-1899); 1880-1899.