Althorp Papers. Vol. mcmxxiii. 1. Applications for the agency of the Kilkenny Estates, with related correspondence; 1877. Includes letters by Lilah, Lady Clifden. 2. Miscellaneous papers relating to the Clifden Trust; 1878, 1883.
Harrow 77224-77231. Althorp Papers. Vols. mcmxxiv-mcmxxxi. Correspondence and papers relating to Harrow School. Spencer was a pupil at Harrow and retained close links with the school throughout his life. In 1870 he became Chairman of the Governors, a post he held until 1908. Eight volumes.
Althorp Papers. Vols. mcmxxv, mcmxxvi. Correspondence with Very Rev. Henry Montague-Butler, D.C.L., L.L.D., a contemporary of Spencer at Harrow, Headmaster (1859-1885), Governor of the school (1901-1917); 1853-1910. Two volumes.
Althorp Papers. Vol. mcmxxviii. 1. Letters from Rev. Joseph Wood, D.D., Headmaster of Harrow (1899-1910); 1899-1910. 2. Correspondence with Young, Jackson, Beard and King, solicitors relating to Harrow School; 1898-1908.
Althorp Papers. Vols. mcmxxix-mcmxxxi. Miscellaneous correspondence and papers relating to the administration of Harrow school, including accounts, examiners, repairs to the Headmaster's House, appointment of a Headmaster, etc.; 1866-1896. Partly printed. Correspondents include Rev. J. E. C. Welldon and Charles Saville Roundell, M.P., etc.; Three volumes.