Columbia subject headings:
Abolitionists--History--Dictionaries.
Antislavery movements--History--Dictionaries.
Slave trade--History--Dictionaries.
Slavery--History--Dictionaries.
Harvard subject headings:
Slavery--Dictionaries.
Slavery--History--Dictionaries.
Princeton subject headings:
Dictionaries.
Slavery--Dictionaries.
Slavery--History--Dictionaries.