Political, semi-official, personal and family correspondence and papers of Sir Maurice de Bunsen, consisting of:
- De Bunsen's correspondence and papers, 1852-1932 (making up the bulk of this collection). They fall into two groups: letters written by de Bunsen to his family, and letters written to de Bunsen and his professional and private papers
- Social and family correspondence and papers of Berta Mary de Bunsen (ne Lowry-Corry, 1869-1954), ca. 1890-1945
- Miscellaneous family and other correspondence and papers of Montagu William Lowry-Corry, Lord Rowton (1838-1903), uncle of Berta Mary de Bunsen, private secretary to Disraeli, 1866-81, ca. 1877-1916
- Diaries, correspondence, sketches etc. of Elizabeth Gurney (d 1903), mother of Maurice de Bunsen, third daughter of Samuel Gurney of Earlham, married to Ernest Christian Ludwig de Bunsen (d 1903) of Abbey Lodge, Regent's Park, (he was the second son of Baron von Bunsen, Prussian minister in England, 1841-54), and of her sisters Richenda Cunningham and Sarah Gurney, ca. 1826-50