Reproduces personal, business, and official correspondence; diaries; orderly book; lists of Ohio Company agents and sales; petitions; contracts; pamphlets; wills, tax slips, receipts, and other documents relating to the Sargent estate; an agricultural notebook; plats and survey reports; and other papers relating to the St. Clair expedition of which Sargent was adjutant general; to Sargent's survey of the 5th range, Northwest Territory; a trip from Marietta, Ohio, to Cahokia, Ill., with Governor Arthur St. Clair; Sargent's plantations near Natchez; the Congressional investigation of Sargent's administration of the Mississippi Territory and his dismissal; the Ohio Company; the early settlement and administration of the Northwest Territory; relations with the Spanish governments of Louisiana and West Florida; and military, business, and family matters.