Columbia subject headings:
Harvard subject headings:
Portugal--History--Modern, 1580-
Portugal--Politics and government.
Princeton subject headings:
Political science--Portugal--History--18th century.
Political science--Portugal--History--19th century.
Portugal--History--1789-1900.
Portugal--History--Joseph, 1750-1777.
Portugal--History--Maria I, 1777-1816.
Portugal--Politics and government.
Portugal--Social conditions.