Columbia subject headings:
African Americans--Dictionaries.
African Americans--Encyclopedias.
Slavery--United States--History--Dictionaries.
Harvard subject headings:
African Americans--Dictionaries and encyclopedias.
African Americans--History--To 1863--Dictionaries.
Slavery--United States--History--Dictionaries.
Princeton subject headings:
African Americans--Dictionaries.
Slavery--United States--History--Dictionaries.