SUPPLEMENTARY MITCHELL PAPERS. Vols. V, VI. Correspondence with Barons von Munchhausen, Hanoverian statesmen; 1756-1766. Mostly French, partly German. Two volumes.
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.
SUPPLEMENTARY MITCHELL PAPERS. Vols. XV-XVIII. Correspondence and papers relating to Mitchell's work as Commissioner at Brussels; 1751-1754, n.d. Chiefly copies. Four volumes.
SUPPLEMENTARY MITCHELL PAPERS. Vols. LVI-LXIII. Accounts relating to specific departments of Mitchell's household, mostly in Germany; 1756-1771, n.d. Mostly French and German. Eight volumes.
SUPPLEMENTARY MITCHELL PAPERS. Vols. LXIV-LXXXI. General household and personal accounts, bills and receipts; 1736-1771, n.d. Mostly French and German. Eighteen volumes.