SUPPLEMENTARY MITCHELL PAPERS. Vols. V, VI. Correspondence with Barons von Munchhausen, Hanoverian statesmen; 1756-1766. Mostly French, partly German. Two volumes.
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).
SUPPLEMENTARY MITCHELL PAPERS. Vols. XII-XIV. Correspondence, papers, treaties, etc.; 1495-1740. Copies and extracts, mid 18th cent. Partly Latin and French. Probably collected in connection with Mitchell's work as Commissioner at Brussels for negotiation of a treaty with Austria concerning trade in the Netherlands, 1751-1754. Three volumes.