Columbia subject headings:
Antislavery movements--History.
Slavery--History.
Slaves--Emancipation--History.
Harvard subject headings:
Antislavery movements--History.
Slave trade--History
Slavery--History
Slaves--Emancipation--History.
Princeton subject headings:
Antislavery movements--History.
Slave trade--History.
Slavery--History.
Slaves--Emancipation--History.