Althorp Papers. Vol. md. Letters from his sister, Lady Sarah Spencer. For Spencer's letters to Sarah see Add. MSS 77720-77722 below; 1851, [1856?]-1910.
Althorp Papers. Vol. mdviii. Letters from: 1. His uncle, George Spencer, known as Father Ignatius, Superior of the Order of Passionists in London; 1858-1863. 2. His aunt Frances, Dowager Lady Clinton; 1851-1872, n.d.
Althorp Papers. Vol. mcmiii. 1. Letters from Gen. W. Cartwright of Flore House, Weedon, relating to the setting up of a Northamptonshire Club in Northampton and other local matters; 1858-1872. 2. Correspondence with Maj. George John Whyte-Melville of Wootton Hall, Northampton, writer and hunts...
Althorp Papers. Vol. lxxxix (ff. ). Establishment of the household of James, Duke of York, including those of his Duchess, but excluding that of his daughter Anne, who had a separate establishment after her marriage in 1683; compiled on internal evidence in Dec. 1684 or Jan. 1685, but left unsig...