Althorp Papers. Vol. mmdcxv. 1. General correspondence of Sir Thomas Biddulph; 1856-1877. 2. Letters to Lady Mary Biddulph, wife of Sir Thomas; 1849-1892, n.d.
Althorp Papers. Vol. mmdcccxxxiv. 'The Consolidated Chapelry of S. James Dallington', co. Northt., by F. H. Hayward; [19th cent.?]. Scale: 3 chains to the inch [1:2376]. North at top. Depicts Duston village, including the school and church, roads, paths, and waterways, railway and tramway, mills...
Althorp Papers. Vol. cxxxviii-cxlii. Spencer's executors v. Sir Abraham Janssen, 2nd Bart.: Chancery proceedings concerning a debt contracted by Spencer on a post. obit. bond, as heir of Sarah, Duchess of Marlborough; 1747-1751. Partly drafts and copies. For Lord Hardwicke's notes on the case, see Add. MS. 36063, ff. 97-113. Five volumes.