Columbia subject headings:
Brazil--Foreign relations.
Brazil--History--Empire, 1822-1889.
Rio Grande do Sul (Brazil : State)--History.
Harvard subject headings:
Brazil--Foreign relations.
Brazil--History--Empire, 1822-1889.
Rio Grande do Sul (Brazil : State)--History
Princeton subject headings:
Brazil--Foreign relations.
Brazil--History--Empire, 1822-1889.
Rio Grande do Sul (Brazil : State)--History.