Althorp Papers. Vols. mdcccxci-mdcccxciii. Correspondence with local M.P.s. mostly relating to local affairs, e.g. County Council, Quarter Sessions, appointment of magistrates, etc., with only limited references to national politics; 1857-1910. See also Northamptonshire Record Office, SOX350, late nineteenth century. Three volumes.
Althorp Papers. Vols. mdcccxciv-mdcccxcviii. Correspondence with H. P. Markham, solicitor; Clerk of the Peace, co. Northant., also a number of letters by his son and assistant, Christopher, later Deputy Clerk of the Peace and Deputy Clerk of the County Council; 1856-1910. Partly printed. Five volumes.
Althorp Papers. Vol. mcmxiv. Correspondence with: 1. Lord Braye, rel. to local politics, Pytchley Hunt, etc.; 1885-1893, 1899. 2. J. Rennie Wilkinson of Shooter's Hill, Thrapstone, rel. to the appointment of magistrates, elections, etc.; 1887-1908.
Althorp Papers. Vol. mcm. Correspondence with William Henry Fitzroy, 6th Duke of Grafton, Lt.-Col. of the 1st Adm. Battalion Northamptonshire Rifle Volunteers; 1857-1882. Correspondence relates to rifle-shooting, his brother's candidature at the 1865 and 1868 elections, local affairs, etc.
Althorp Papers. Vol. mcmi. Correspondence with Augustus Charles Lennox Fitzroy, Lord Euston, later 7th Duke of Grafton; 1882-1910. Correspondence relates to 1st Northants. Rifle Volunteer Corps; local magistrates, the Savings Bank, etc.