Supplementary miscellanea are arranged in six sub-subfonds, and include material relating to Sir Isaac Newton and the agriculturalist Arthur Young (1741-1820):
- BAG/22/1: Rev. John Ashe of Ashford, Derbyshire, 1728-49, 7 items;
- BAG/22/2: Clay Family of Bridge House, Yorkshire, 1660-1814, 17 items;
- BAG/22/3: Clegg Family of Chinley, Derbyshire, 1748-60, 7 items;
- BAG/22/4: Thomas Cresswell of Tideswell, Derbyshire, 1728-39, 13 items;
- BAG/22/5: Sir Isaac Newton, 1705, 2 items;
- BAG/22/6: Young of Bradfield Hall, Suffolk, 1805-23, 2 series, 15 items.