Columbia subject headings:
Free choice of employment--Brazil--History.
Slavery--Law and legislation--Brazil--History.
Slaves--Emancipation--Brazil--History.
Harvard subject headings:
Free choice of employment--Brazil--History.
Slavery--Law and legislation--Brazil--History.
Slaves--Emancipation--Brazil--History.
Princeton subject headings:
Free choice of employment--Brazil--History.
Slavery--Law and legislation--Brazil--History.
Slaves--Emancipation--Brazil--History.