Columbia subject headings:
Salt industry and trade--Brazil--Rio de Janeiro--History--19th century.
Salt--Brazil--Rio de Janeiro (State)--History--19th century.
Salt--Economic aspects--Brazil--Rio de Janeiro (State)
Salt--History--19th century.
Harvard subject headings:
Rio de Janeiro (Brazil : State)--History--19th century.
Salt industry and trade--Brazil--Rio de Janeiro (State)--History--19th century.
Princeton subject headings:
Salt industry and trade--Brazil--Rio de Janeiro--History--19th century.
Salt--Brazil--Rio de Janeiro (State)--History--19th century.
Salt--Economic aspects--Brazil--Rio de Janeiro (State).
Salt--History--19th century.