Columbia subject headings:
Harvard subject headings:
Land settlement--Environmental aspects--Brazil--Rio Grande do Sul--History.
Rio Grande do Sul (Brazil : State)--History
Princeton subject headings:
Environmental policy--Brazil--Rio Grande do Sul.
Rio Grande do Sul (Brazil)--Colonization--Environmental aspects--History--19th century.
Rio Grande do Sul (Brazil)--Colonization--Environmental aspects--History--20th century.
Rio Grande do Sul (Brazil)--Emigration and immigration--History--19th century.
Rio Grande do Sul (Brazil)--Emigration and immigration--History--20th century.
Rio Grande do Sul (Brazil)--Environmental conditions.