Althorp Papers. Vol. mmdccvii. Catalogue of Georgiana, Countess Spencer's library at Holywell House, St. Albans. It was formed from the books which were saved from the fire at Wimbledon; 1785.
Althorp Papers. Vol. mmdcccxlii. Muscott. 'A Plan and Survey of the Estate at Muscott in the Parish of Norton and the Piece of New Inclosure in Muscott Field (Extra Parochial) in the County of Northampton Belonging to The Rt. Honble Earl Spencer. Survey'd in the Year 1778 By John Corris'; 1778. ...
Althorp Papers. Vols. iii, iv. Papers of Robert, 1st Baron Spencer, relating to his mission to invest Frederick, Duke of Wurttemberg with the Order of the Garter; 1603. Two volumes.
Althorp Papers. Vols. mcdii, mcdiii. Letters and correspondence relating to local politics; 1831-1857. Specifically, the Worcester election in 1831, the Midhurst elections in 1832 and 1837 and the south Northamptonshire elections in 1847 and 1857. See also Northamptonshire Record Office, SOX265; 1831 and SOX330. Two volumes.