Columbia subject headings:
United States--Commerce--History--18th century--Statistics.
United States--Commerce--History--18th century.
United States--Economic conditions--To 1865.
Harvard subject headings:
United States--Commerce--History--18th century--Statistics.
United States--Commerce--History--18th century.
United States--Economic conditions--To 1865.
Princeton subject headings:
United States--Commerce--History--18th century--Statistics.
United States--Commerce--History--18th century.
United States--Economic conditions--To 1865.