SUPPLEMENTARY MITCHELL PAPERS. Vol. X (ff. 119). General Correspondence; 1756-1767. Included (f. 111) are coloured plans of the town and port of Dunkirk, 1763, 1764. includes: f. 111 Maps and Plans: Dunkirk, Nord: Plans of town and port of Dunkirk: 1763, 1764.
SUPPLEMENTARY MITCHELL PAPERS. Vol. XI (ff. 46). Letter-book, containing mostly drafts of letters, with accounts, and memoranda on Parliamentary and legal matters, etc.; 1735-1740, n.d. Accounts apparently dated 1799 occur (f. 42v).