Columbia subject headings:
Brazil--History--19th century.
Portugal--Colonies--Africa--History--19th century.
Portugal--Colonies--Africa--History--20th century.
Portugal--Colonies--South America--History--19th century.
Harvard subject headings:
Brazil--History--19th century.
Portugal--Colonies--Africa--History--19th century.
Portugal--Colonies--Africa--History--20th century.
Portugal--Colonies--America--History--19th century.
Princeton subject headings:
Brazil--History--19th century.
Portugal--Colonies--Africa--History--19th century.
Portugal--Colonies--Africa--History--20th century.
Portugal--Colonies--America--History--19th century.