Columbia subject headings:
Harvard subject headings:
Labor movement--Brazil--Passo Fundo--History.
Labor movement--Brazil--Rio Grande do Sul (State)--History.
Passo Fundo (Brazil)--History.
Rio Grande do Sul (Brazil : State)--History
Working class--Brazil--Passo Fundo--History.
Working class--Brazil--Rio Grande do Sul (State)--History.
Princeton subject headings:
Labor movement--Brazil--Passo Fundo--History--20th century.