Althorp Papers. Vol. mmdxcvi. Account book showing Sir George Francis Seymour and Sir Horace Beauchamp Seymour's account with Messrs. Child and Co.; 1839-1844. Bound volume.
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...