Columbia subject headings:
Europe--History--1648-1789.
Europe--History--1789-1815.
Great powers--History--17th century.
Great powers--History--18th century.
Great powers--History--19th century.
Harvard subject headings:
Europe--History--1648-1789.
Europe--History--1789-1815.
Great powers--History--17th century.
Great powers--History--18th century.
Great powers--History--19th century.
Princeton subject headings:
Europe--History--1648-1789.
Europe--History--1789-1815.
Great powers--History--17th century.
Great powers--History--18th century.
Great powers--History--19th century.