Columbia subject headings:
Commerce--History.
Connecticut River Valley--History--Colonial period, ca. 1600-1775.
United States--History--Colonial period, ca. 1600-1775.
Harvard subject headings:
Human ecology--New England--History--17th century.
Human ecology--New England--History--18th century.
New England--Commerce--History--17th century.
New England--Commerce--History--18th century.
New England--Environmental conditions--History--17th century.
New England--Environmental conditions--History--18th century.
Princeton subject headings:
Commerce--History.
Connecticut River Valley--History--Colonial period, ca. 1600-1775.
United States--History--Colonial period, ca. 1600-1775.