Jacob Gerhard Koch papers, 1783-1941
Merchant and marine insurance broker. Correspondence, letterbooks, diary, account books, ledgers, inventories, indexes, receipts, and miscellaneous documents relating to Koch’s investment business in Philadelphia, Amsterdam, and Alexandria, Va.
Koch, Jacob Gerhard
Mercy-Argenteau family papers, 1410-1921
Correspondence, commissions, diplomas, certificates, and other documents. Includes military papers relating to the Silesian War and Seven Years' War, letters from King Leopold II of Austria, and material relating to California and Mexico.