Columbia subject headings:
Ohio River Valley--History--To 1795.
Pennsylvania--History--Colonial period, ca. 1600-1775.
Washington's Expedition to the Ohio, 1st, 1753-1754.
Harvard subject headings:
Ohio River Valley--History--To 1795.
Pennsylvania--History--Colonial period, ca. 1600-1775.
Washington's Expedition to the Ohio, 1st, 1753-1754.
Princeton subject headings:
Ohio River Valley--History--To 1795.
Pennsylvania--History--Colonial period, ca. 1600-1775.
Washington's Expedition to the Ohio, 1st, 1753-1754.