Columbia subject headings:
Rio Grande do Sul (Brazil : State)--History.
Slavery--Brazil--Rio Grande do Sul (State)--History.
Harvard subject headings:
Rio Grande do Sul (Brazil : State)--History
Slavery--Brazil--Rio Grande do Sul (State)--History.
Slavery--Brazil--Rio Grande do Sul--History.
Princeton subject headings:
Rio Grande do Sul (Brazil : State)--History.
Slavery--Brazil--Rio Grande do Sul--History.