Columbia subject headings:
Harvard subject headings:
Brazil--Foreign relations--1822-1889.
Brazil--History--Empire, 1822-1889.
Slave trade--Brazil--History.
Slavery--Brazil--History--19th century
Princeton subject headings:
Brazil--Foreign relations--1822-1889.
Brazil--History--Empire, 1822-1889.
Slavery--Brazil--History--19th century.