Columbia subject headings:
Harvard subject headings:
Brazil--History--1763-1822.
Monarchy--Portugal--History--19th century.
Peninsular War, 1807-1814--Portugal.
Portugal--History--Maria I, 1777-1816.
Torres Vedras (Portugal)--History--19th century.
Princeton subject headings:
Monarchy--Portugal--History--19th century.
Peninsular War,--Portugal.
Portugal--History--Maria I, 1777-1816.